Speed up quad deserialization.

cc/quads/largest_draw_quad.cc

 // Copyright 2014 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.
 
 #include "cc/quads/largest_draw_quad.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
 #include "cc/quads/debug_border_draw_quad.h"
 #include "cc/quads/picture_draw_quad.h"
 #include "cc/quads/render_pass_draw_quad.h"
 #include "cc/quads/solid_color_draw_quad.h"
 #include "cc/quads/stream_video_draw_quad.h"
 #include "cc/quads/surface_draw_quad.h"
 #include "cc/quads/texture_draw_quad.h"
 #include "cc/quads/tile_draw_quad.h"
 #include "cc/quads/yuv_video_draw_quad.h"
 
 namespace {
-const size_t kLargestDrawQuadSize =
-    sizeof(cc::YUVVideoDrawQuad) + sizeof(gfx::ColorSpace);
+const size_t kLargestDrawQuadSize = sizeof(cc::YUVVideoDrawQuad);
 }  // namespace
 
 namespace cc {
 
-size_t LargestDrawQuadSize() {
+size_t LargestDrawQuadSubclassSize() {
   // Currently the largest quad is either a RenderPassDrawQuad or a
   // StreamVideoDrawQuad depends on hardware structure.
 
   // Use compile assert to make sure largest is actually larger than all other
   // type of draw quads.
   static_assert(sizeof(DebugBorderDrawQuad) <= kLargestDrawQuadSize,
                 "Largest Draw Quad size needs update. DebugBorderDrawQuad is "
                 "currently largest.");
   static_assert(sizeof(PictureDrawQuad) <= kLargestDrawQuadSize,
                 "Largest Draw Quad size needs update. PictureDrawQuad is "
@@ skipping 10 matching lines @@
   static_assert(sizeof(TileDrawQuad) <= kLargestDrawQuadSize,
                 "Largest Draw Quad size needs update. TileDrawQuad is "
                 "currently largest.");
   static_assert(sizeof(YUVVideoDrawQuad) <= kLargestDrawQuadSize,
                 "Largest Draw Quad size needs update. YUVVideoDrawQuad is "
                 "currently largest.");
 
   return kLargestDrawQuadSize;
 }
 
+size_t LargestDrawQuadSerializedSize() {
+  return std::max<size_t>(kLargestDrawQuadSize,
+                          sizeof(YUVVideoDrawQuad) + sizeof(gfx::ColorSpace));
+}
+
 }  // namespace cc