Add command buffer support for GL_RGB CHROMIUM image emulation.

gpu/command_buffer/service/texture_manager.h

Index: gpu/command_buffer/service/texture_manager.h
diff --git a/gpu/command_buffer/service/texture_manager.h b/gpu/command_buffer/service/texture_manager.h
index 2485146677adff6954f45c6546ebc696ad37ed64..7fa0697556bedc6106c78d5c0ef79aff5940c1f4 100644
--- a/gpu/command_buffer/service/texture_manager.h
+++ b/gpu/command_buffer/service/texture_manager.h
@@ -269,6 +269,8 @@ class GPU_EXPORT Texture {
 
   void ApplyFormatWorkarounds(FeatureInfo* feature_info);
 
+  bool EmulatingRGB();
+
  private:
   friend class MailboxManagerImpl;
   friend class MailboxManagerSync;
@@ -488,6 +490,10 @@ class GPU_EXPORT Texture {
   // texture.
   void UpdateHasImages();
 
+  // Updates the flag that indicates whether this texture requires RGB
+  // emulation.
+  void UpdateEmulatingRGB();
+
   // Increment the framebuffer state change count in all the managers
   // referencing this texture.
   void IncAllFramebufferStateChangeCount();
@@ -592,6 +598,8 @@ class GPU_EXPORT Texture {
 
   const CompatibilitySwizzle* compatibility_swizzle_;
 
+  bool emulating_rgb_;
+
   DISALLOW_COPY_AND_ASSIGN(Texture);
 };