Complete disable_gl_rgb_format workaround for Mali-400 GPU

gpu/command_buffer/service/context_state.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file contains the ContextState class.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_CONTEXT_STATE_H_
 #define GPU_COMMAND_BUFFER_SERVICE_CONTEXT_STATE_H_
 
 #include <vector>
@@ skipping 191 matching lines @@
                                  GLboolean blue,
                                  GLboolean alpha) {
     if (cached_color_mask_red == red && cached_color_mask_green == green &&
         cached_color_mask_blue == blue && cached_color_mask_alpha == alpha &&
         !ignore_cached_state)
       return;
     cached_color_mask_red = red;
     cached_color_mask_green = green;
     cached_color_mask_blue = blue;
     cached_color_mask_alpha = alpha;
-    glColorMask(red, green, blue, alpha);
+    glColorMask(red, green, blue, emulating_rgb_with_rgba ? false : alpha);
   }
 
   inline void SetDeviceDepthMask(GLboolean mask) {
     if (cached_depth_mask == mask && !ignore_cached_state)
       return;
     cached_depth_mask = mask;
     glDepthMask(mask);
   }
 
   inline void SetDeviceStencilMaskSeparate(GLenum op, GLuint mask) {
@@ skipping 64 matching lines @@
   bool bound_renderbuffer_valid;
 
   // The currently bound valuebuffer
   scoped_refptr<Valuebuffer> bound_valuebuffer;
 
   bool pack_reverse_row_order;
   bool ignore_cached_state;
 
   mutable bool fbo_binding_for_scissor_workaround_dirty;
 
+  bool emulating_rgb_with_rgba;
+
  private:
   void EnableDisable(GLenum pname, bool enable) const;
 
   // If a buffer object is bound to PIXEL_PACK_BUFFER, set all pack parameters
   // user values; otherwise, set them to 0.
   void UpdatePackParameters() const;
   // If a buffer object is bound to PIXEL_UNPACK_BUFFER, set all unpack
   // parameters user values; otherwise, set them to 0.
   void UpdateUnpackParameters() const;
 
   void InitStateManual(const ContextState* prev_state) const;
 
   FeatureInfo* feature_info_;
   scoped_ptr<ErrorState> error_state_;
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_CONTEXT_STATE_H_
-