Add logic to GLRenderer to support RenderPassDrawQuad copying.

cc/output/ca_layer_overlay.h

 // Copyright 2015 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.
 
 #ifndef CC_OUTPUT_CA_LAYER_OVERLAY_H_
 #define CC_OUTPUT_CA_LAYER_OVERLAY_H_
 
 #include "base/memory/ref_counted.h"
 #include "cc/quads/render_pass.h"
 #include "third_party/skia/include/core/SkColor.h"
@@ skipping 44 matching lines @@
   // The contents rect property for the CALayer.
   gfx::RectF contents_rect;
   // The bounds for the CALayer in pixels.
   gfx::RectF bounds_rect;
   // The background color property for the CALayer.
   SkColor background_color = SK_ColorTRANSPARENT;
   // The edge anti-aliasing mask property for the CALayer.
   unsigned edge_aa_mask = 0;
   // The minification and magnification filters for the CALayer.
   unsigned filter;
+
+  // If valid, the renderer must copy the contents of the render pass into an
+  // overlay resource to use as the contents.
+  RenderPassId render_pass_id;
 };
 
 typedef std::vector<CALayerOverlay> CALayerOverlayList;
 
 // Returns true if all quads in the root render pass have been replaced by
 // CALayerOverlays.
 bool ProcessForCALayerOverlays(ResourceProvider* resource_provider,
                                const gfx::RectF& display_rect,
                                const QuadList& quad_list,
                                CALayerOverlayList* ca_layer_overlays);
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_CA_LAYER_OVERLAY_H_