Add command buffer support for GL_RGB CHROMIUM image emulation.

gpu/command_buffer/service/texture_manager.cc

Index: gpu/command_buffer/service/texture_manager.cc
diff --git a/gpu/command_buffer/service/texture_manager.cc b/gpu/command_buffer/service/texture_manager.cc
index 8297c6d04556fbdee6806487b6a81552810637e3..7398f93d0dd6883fd145fff79d4123e88bab2d8b 100644
--- a/gpu/command_buffer/service/texture_manager.cc
+++ b/gpu/command_buffer/service/texture_manager.cc
@@ -1621,6 +1621,16 @@ void Texture::ApplyFormatWorkarounds(FeatureInfo* feature_info) {
   }
 }
 
+bool Texture::EmulatingRGB() {
+  for (const FaceInfo& face_info : face_infos_) {
+    for (const LevelInfo& level_info : face_info.level_infos) {
+      if (level_info.image && level_info.image->EmulatingRGB())

[piman, 2016/04/14 01:05:43]

EmulatingRGB is constant for the lifetime of the image. So could we evaluate
this in SetLevelImageInternal?

[erikchen, 2016/04/14 21:24:47]

Done.

+        return true;
+    }
+  }
+  return false;
+}
+
 TextureRef::TextureRef(TextureManager* manager,
                        GLuint client_id,
                        Texture* texture)