gpu: Mailbox emulation with EGLImage

gpu/command_buffer/service/framebuffer_manager.cc

Index: gpu/command_buffer/service/framebuffer_manager.cc
diff --git a/gpu/command_buffer/service/framebuffer_manager.cc b/gpu/command_buffer/service/framebuffer_manager.cc
index 48e503cb45b3d1e64986d369edfe70d7f3557c16..2587014e7e6981148d4e5efd39c853b006f91eda 100644
--- a/gpu/command_buffer/service/framebuffer_manager.cc
+++ b/gpu/command_buffer/service/framebuffer_manager.cc
@@ -119,6 +119,9 @@ class RenderbufferAttachment
     renderbuffer_->AddToSignature(signature);
   }
 
+  virtual void OnWillRenderTo() const OVERRIDE {}
+  virtual void OnDidRenderTo() const OVERRIDE {}
+
  protected:
   virtual ~RenderbufferAttachment() { }
 
@@ -243,6 +246,14 @@ class TextureAttachment
         texture_ref_.get(), target_, level_, signature);
   }
 
+  virtual void OnWillRenderTo() const OVERRIDE {
+    texture_ref_->texture()->OnWillModifyPixels();
+  }
+
+  virtual void OnDidRenderTo() const OVERRIDE {
+    texture_ref_->texture()->OnDidModifyPixels();
+  }
+
  protected:
   virtual ~TextureAttachment() {}