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..7dfba400d24704d31a79cba36c62655b1c81bba8 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() {}
 
@@ -615,6 +626,20 @@ void Framebuffer::OnTextureRefDetached(TextureRef* texture) {
   manager_->OnTextureRefDetached(texture);
 }
 
+void Framebuffer::OnWillRenderTo() const {
+  for (AttachmentMap::const_iterator it = attachments_.begin();
+       it != attachments_.end(); ++it) {
+    it->second->OnWillRenderTo();
+  }
+}
+
+void Framebuffer::OnDidRenderTo() const {
+  for (AttachmentMap::const_iterator it = attachments_.begin();
+       it != attachments_.end(); ++it) {
+    it->second->OnDidRenderTo();
+  }
+}
+
 bool FramebufferManager::GetClientId(
     GLuint service_id, GLuint* client_id) const {
   // This doesn't need to be fast. It's only used during slow queries.