Migrate FlutterUIPressProxy, ios_context*, rendering_api_selection, and a few other files to ARC (#51633)

Smart pointers support ARC as of #47612, and the unit tests were migrated in #48162.

Migrate some files from MRC to ARC.  These files do not themselves import any MRC files, only ARC-ified files like `FlutterMetalLayer.h`, making them leaf nodes in the dependency graph of MRC files.  Just doing a few at a time to make the dependency graph manageable, and to easily revert if this causes retain cycles or other memory management issues.

Part of flutter/flutter#137801.

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style

Author: jmagman

shell/platform/darwin/ios/BUILD.gn

@@ -78,12 +78,32 @@ source_set("flutter_framework_source_arc") {
     "framework/Source/FlutterTextInputPlugin.mm",
     "framework/Source/FlutterTextureRegistryRelay.h",
     "framework/Source/FlutterTextureRegistryRelay.mm",
+    "framework/Source/FlutterUIPressProxy.h",
+    "framework/Source/FlutterUIPressProxy.mm",
     "framework/Source/KeyCodeMap.g.mm",
     "framework/Source/KeyCodeMap_Internal.h",
     "framework/Source/UIViewController+FlutterScreenAndSceneIfLoaded.h",
     "framework/Source/UIViewController+FlutterScreenAndSceneIfLoaded.mm",
+    "framework/Source/connection_collection.h",
+    "framework/Source/connection_collection.mm",
+    "framework/Source/platform_message_response_darwin.h",
+    "framework/Source/platform_message_response_darwin.mm",
+    "framework/Source/profiler_metrics_ios.h",
+    "framework/Source/profiler_metrics_ios.mm",
     "framework/Source/vsync_waiter_ios.h",
     "framework/Source/vsync_waiter_ios.mm",
+    "ios_context.h",
+    "ios_context.mm",
+    "ios_context_metal_impeller.h",
+    "ios_context_metal_impeller.mm",
+    "ios_context_metal_skia.h",
+    "ios_context_metal_skia.mm",
+    "ios_context_software.h",
+    "ios_context_software.mm",
+    "ios_external_texture_metal.h",
+    "ios_external_texture_metal.mm",
+    "rendering_api_selection.h",
+    "rendering_api_selection.mm",
   ]
 
   frameworks = [
@@ -92,11 +112,16 @@ source_set("flutter_framework_source_arc") {
   ]
 
   deps += [
+    ":ios_gpu_configuration",
     "//flutter/common:common",
+    "//flutter/common/graphics",
     "//flutter/lib/ui",
     "//flutter/runtime",
     "//flutter/shell/common",
+    "//flutter/shell/platform/darwin/common",
+    "//flutter/shell/platform/darwin/graphics",
     "//flutter/shell/platform/embedder:embedder_as_internal_library",
+    "//flutter/shell/profiling:profiling",
   ]
 }
 
@@ -132,8 +157,6 @@ source_set("flutter_framework_source") {
     "framework/Source/FlutterSemanticsScrollView.mm",
     "framework/Source/FlutterSpellCheckPlugin.h",
     "framework/Source/FlutterSpellCheckPlugin.mm",
-    "framework/Source/FlutterUIPressProxy.h",
-    "framework/Source/FlutterUIPressProxy.mm",
     "framework/Source/FlutterUndoManagerDelegate.h",
     "framework/Source/FlutterUndoManagerPlugin.h",
     "framework/Source/FlutterUndoManagerPlugin.mm",
@@ -147,22 +170,6 @@ source_set("flutter_framework_source") {
     "framework/Source/accessibility_bridge.mm",
     "framework/Source/accessibility_text_entry.h",
     "framework/Source/accessibility_text_entry.mm",
-    "framework/Source/connection_collection.h",
-    "framework/Source/connection_collection.mm",
-    "framework/Source/platform_message_response_darwin.h",
-    "framework/Source/platform_message_response_darwin.mm",
-    "framework/Source/profiler_metrics_ios.h",
-    "framework/Source/profiler_metrics_ios.mm",
-    "ios_context.h",
-    "ios_context.mm",
-    "ios_context_metal_impeller.h",
-    "ios_context_metal_impeller.mm",
-    "ios_context_metal_skia.h",
-    "ios_context_metal_skia.mm",
-    "ios_context_software.h",
-    "ios_context_software.mm",
-    "ios_external_texture_metal.h",
-    "ios_external_texture_metal.mm",
     "ios_external_view_embedder.h",
     "ios_external_view_embedder.mm",
     "ios_surface.h",
@@ -177,8 +184,6 @@ source_set("flutter_framework_source") {
     "platform_message_handler_ios.mm",
     "platform_view_ios.h",
     "platform_view_ios.mm",
-    "rendering_api_selection.h",
-    "rendering_api_selection.mm",
   ]
 
   sources += _flutter_framework_headers
@@ -191,17 +196,14 @@ source_set("flutter_framework_source") {
   deps += [
     ":ios_gpu_configuration",
     "//flutter/common",
-    "//flutter/common/graphics",
     "//flutter/flow",
     "//flutter/fml",
-    "//flutter/lib/ui",
     "//flutter/runtime",
     "//flutter/runtime:libdart",
     "//flutter/shell/common",
     "//flutter/shell/platform/common:common_cpp_input",
     "//flutter/shell/platform/darwin/common",
     "//flutter/shell/platform/darwin/common:framework_common",
-    "//flutter/shell/platform/darwin/graphics",
     "//flutter/shell/platform/embedder:embedder_as_internal_library",
     "//flutter/shell/profiling:profiling",
     "//flutter/skia",

shell/platform/darwin/ios/framework/Source/FlutterUIPressProxy.mm

@@ -2,9 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#import "flutter/shell/platform/darwin/ios/framework/Source/FlutterUIPressProxy.h"
+
 #import <UIKit/UIKit.h>
 
-#import "flutter/shell/platform/darwin/ios/framework/Source/FlutterUIPressProxy.h"
+#import "flutter/shell/platform/darwin/common/framework/Headers/FlutterMacros.h"
+
+FLUTTER_ASSERT_ARC
 
 @interface FlutterUIPressProxy ()
 @property(nonatomic, readonly) UIPress* press;

shell/platform/darwin/ios/framework/Source/connection_collection.mm

@@ -4,6 +4,10 @@
 
 #import "flutter/shell/platform/darwin/ios/framework/Source/connection_collection.h"
 
+#import "flutter/shell/platform/darwin/common/framework/Headers/FlutterMacros.h"
+
+FLUTTER_ASSERT_ARC
+
 namespace flutter {
 ConnectionCollection::Connection ConnectionCollection::AquireConnection(const std::string& name) {
   Connection nextConnection = ++counter_;

shell/platform/darwin/ios/framework/Source/platform_message_response_darwin.mm

@@ -4,6 +4,10 @@
 
 #import "flutter/shell/platform/darwin/ios/framework/Source/platform_message_response_darwin.h"
 
+#import "flutter/shell/platform/darwin/common/framework/Headers/FlutterMacros.h"
+
+FLUTTER_ASSERT_ARC
+
 namespace flutter {
 
 PlatformMessageResponseDarwin::PlatformMessageResponseDarwin(

shell/platform/darwin/ios/framework/Source/profiler_metrics_ios.mm

@@ -6,8 +6,11 @@
 
 #import <Foundation/Foundation.h>
 
+#import "flutter/shell/platform/darwin/common/framework/Headers/FlutterMacros.h"
 #import "flutter/shell/platform/darwin/ios/framework/Source/IOKit.h"
 
+FLUTTER_ASSERT_ARC
+
 namespace {
 
 // RAII holder for `thread_array_t` this is so any early returns in

shell/platform/darwin/ios/ios_context.mm

@@ -10,6 +10,8 @@
 #include "flutter/shell/platform/darwin/ios/ios_context_metal_skia.h"
 #include "flutter/shell/platform/darwin/ios/ios_context_software.h"
 
+FLUTTER_ASSERT_ARC
+
 namespace flutter {
 
 IOSContext::IOSContext(MsaaSampleCount msaa_samples) : msaa_samples_(msaa_samples) {}

shell/platform/darwin/ios/ios_context_metal_impeller.h

@@ -25,8 +25,6 @@ class IOSContextMetalImpeller final : public IOSContext {
 
   ~IOSContextMetalImpeller();
 
-  fml::scoped_nsobject<FlutterDarwinContextMetalSkia> GetDarwinContext() const;
-
   IOSRenderingBackend GetBackend() const override;
 
   // |IOSContext|

shell/platform/darwin/ios/ios_context_metal_impeller.mm

@@ -6,6 +6,8 @@
 #include "flutter/impeller/entity/mtl/entity_shaders.h"
 #import "flutter/shell/platform/darwin/ios/ios_external_texture_metal.h"
 
+FLUTTER_ASSERT_ARC
+
 namespace flutter {
 
 IOSContextMetalImpeller::IOSContextMetalImpeller(
@@ -16,11 +18,6 @@
 
 IOSContextMetalImpeller::~IOSContextMetalImpeller() = default;
 
-fml::scoped_nsobject<FlutterDarwinContextMetalSkia> IOSContextMetalImpeller::GetDarwinContext()
-    const {
-  return fml::scoped_nsobject<FlutterDarwinContextMetalSkia>{};
-}
-
 IOSRenderingBackend IOSContextMetalImpeller::GetBackend() const {
   return IOSRenderingBackend::kImpeller;
 }
@@ -54,9 +51,9 @@
     int64_t texture_id,
     fml::scoped_nsobject<NSObject<FlutterTexture>> texture) {
   return std::make_unique<IOSExternalTextureMetal>(
-      fml::scoped_nsobject<FlutterDarwinExternalTextureMetal>{
-          [[darwin_context_metal_impeller_ createExternalTextureWithIdentifier:texture_id
-                                                                       texture:texture] retain]});
+      fml::scoped_nsobject<FlutterDarwinExternalTextureMetal>{[darwin_context_metal_impeller_
+          createExternalTextureWithIdentifier:texture_id
+                                      texture:texture]});
 }
 
 }  // namespace flutter

shell/platform/darwin/ios/ios_context_metal_skia.mm

@@ -10,6 +10,8 @@
 #import "flutter/shell/platform/darwin/ios/ios_external_texture_metal.h"
 #include "third_party/skia/include/gpu/GrContextOptions.h"
 
+FLUTTER_ASSERT_ARC
+
 namespace flutter {
 
 IOSContextMetalSkia::IOSContextMetalSkia(MsaaSampleCount msaa_samples) : IOSContext(msaa_samples) {
@@ -52,8 +54,7 @@
     fml::scoped_nsobject<NSObject<FlutterTexture>> texture) {
   return std::make_unique<IOSExternalTextureMetal>(
       fml::scoped_nsobject<FlutterDarwinExternalTextureMetal>{
-          [[darwin_context_metal_ createExternalTextureWithIdentifier:texture_id
-                                                              texture:texture] retain]});
+          [darwin_context_metal_ createExternalTextureWithIdentifier:texture_id texture:texture]});
 }
 
 }  // namespace flutter

shell/platform/darwin/ios/ios_context_software.mm

@@ -5,6 +5,8 @@
 #import "flutter/shell/platform/darwin/ios/ios_context_software.h"
 #include "ios_context.h"
 
+FLUTTER_ASSERT_ARC
+
 namespace flutter {
 
 IOSContextSoftware::IOSContextSoftware() : IOSContext(MsaaSampleCount::kNone) {}