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..265a47a4efac69d20597856da638afea21df1ef1 100644
--- a/gpu/command_buffer/service/texture_manager.cc
+++ b/gpu/command_buffer/service/texture_manager.cc
@@ -376,7 +376,8 @@ Texture::Texture(GLuint service_id)
       estimated_size_(0),
       can_render_condition_(CAN_RENDER_ALWAYS),
       texture_max_anisotropy_initialized_(false),
-      compatibility_swizzle_(nullptr) {}
+      compatibility_swizzle_(nullptr),
+      emulating_rgb_(false) {}
 
 Texture::~Texture() {
   if (mailbox_manager_)
@@ -866,6 +867,18 @@ void Texture::UpdateHasImages() {
     (*it)->manager()->UpdateNumImages(delta);
 }
 
+void Texture::UpdateEmulatingRGB() {
+  for (const FaceInfo& face_info : face_infos_) {
+    for (const LevelInfo& level_info : face_info.level_infos) {
+      if (level_info.image && level_info.image->EmulatingRGB())
+        emulating_rgb_ = true;
+        return;
+    }
+  }
+  emulating_rgb_ = false;
+}
+
+
 void Texture::IncAllFramebufferStateChangeCount() {
   for (RefSet::iterator it = refs_.begin(); it != refs_.end(); ++it)
     (*it)->manager()->IncFramebufferStateChangeCount();
@@ -1445,6 +1458,7 @@ void Texture::SetLevelImageInternal(GLenum target,
 
   UpdateCanRenderCondition();
   UpdateHasImages();
+  UpdateEmulatingRGB();
 }
 
 void Texture::SetLevelImage(GLenum target,
@@ -1621,6 +1635,10 @@ void Texture::ApplyFormatWorkarounds(FeatureInfo* feature_info) {
   }
 }
 
+bool Texture::EmulatingRGB() {
+  return emulating_rgb_;
+}
+
 TextureRef::TextureRef(TextureManager* manager,
                        GLuint client_id,
                        Texture* texture)