fix bug

Author: xster

shell/gpu/gpu_surface_vulkan.h

@@ -19,10 +19,18 @@ namespace flutter {
 
 class GPUSurfaceVulkan : public Surface {
  public:
+  //------------------------------------------------------------------------------
+  /// @brief      Create a GPUSurfaceVulkan which implicitly creates its own
+  ///             GrDirectContext for Skia.
+  ///
   GPUSurfaceVulkan(GPUSurfaceVulkanDelegate* delegate,
                    std::unique_ptr<vulkan::VulkanNativeSurface> native_surface,
                    bool render_to_surface);
 
+  //------------------------------------------------------------------------------
+  /// @brief      Create a GPUSurfaceVulkan while letting it reuse an existing
+  ///             GrDirectContext.
+  ///
   GPUSurfaceVulkan(const sk_sp<GrDirectContext>& context,
                    GPUSurfaceVulkanDelegate* delegate,
                    std::unique_ptr<vulkan::VulkanNativeSurface> native_surface,

vulkan/vulkan_window.cc

@@ -24,7 +24,7 @@ VulkanWindow::VulkanWindow(fml::RefPtr<VulkanProcTable> proc_table,
     : VulkanWindow(nullptr,
                    proc_table,
                    std::move(native_surface),
-                   render_to_surface);
+                   render_to_surface) {}
 
 VulkanWindow::VulkanWindow(const sk_sp<GrDirectContext>& context,
                            fml::RefPtr<VulkanProcTable> proc_table,

vulkan/vulkan_window.h

@@ -31,10 +31,18 @@ class VulkanBackbuffer;
 
 class VulkanWindow {
  public:
+  //------------------------------------------------------------------------------
+  /// @brief      Construct a VulkanWindow. Let it implicitly create a
+  ///             GrDirectContext.
+  ///
   VulkanWindow(fml::RefPtr<VulkanProcTable> proc_table,
                std::unique_ptr<VulkanNativeSurface> native_surface,
                bool render_to_surface);
 
+  //------------------------------------------------------------------------------
+  /// @brief      Construct a VulkanWindow. Let reuse an existing
+  ///             GrDirectContext built by another VulkanWindow.
+  ///
   VulkanWindow(const sk_sp<GrDirectContext>& context,
                fml::RefPtr<VulkanProcTable> proc_table,
                std::unique_ptr<VulkanNativeSurface> native_surface,