cc: Do solid color analysis before scheduling tiles.

cc/playback/display_list_raster_source.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/playback/display_list_raster_source.h"
 
 #include "base/trace_event/trace_event.h"
 #include "cc/base/region.h"
 #include "cc/debug/debug_colors.h"
 #include "cc/playback/display_item_list.h"
@@ skipping 199 matching lines @@
   return picture;
 }
 
 size_t DisplayListRasterSource::GetPictureMemoryUsage() const {
   if (!display_list_)
     return 0;
   return display_list_->ApproximateMemoryUsage() +
          painter_reported_memory_usage_;
 }
 
-void DisplayListRasterSource::PerformSolidColorAnalysis(
+bool DisplayListRasterSource::PerformSolidColorAnalysis(
     const gfx::Rect& content_rect,
     float contents_scale,
-    DisplayListRasterSource::SolidColorAnalysis* analysis) const {
-  DCHECK(analysis);
+    SkColor* color) const {
   TRACE_EVENT0("cc", "DisplayListRasterSource::PerformSolidColorAnalysis");
 
   gfx::Rect layer_rect =
       gfx::ScaleToEnclosingRect(content_rect, 1.0f / contents_scale);
 
   layer_rect.Intersect(gfx::Rect(size_));
   skia::AnalysisCanvas canvas(layer_rect.width(), layer_rect.height());
   RasterForAnalysis(&canvas, layer_rect, 1.0f);
-  analysis->is_solid_color = canvas.GetColorIfSolid(&analysis->solid_color);
+  return canvas.GetColorIfSolid(color);
 }
 
 void DisplayListRasterSource::GetDiscardableImagesInRect(
     const gfx::Rect& layer_rect,
     float raster_scale,
     std::vector<DrawImage>* images) const {
   DCHECK_EQ(0u, images->size());
   display_list_->GetDiscardableImagesInRect(layer_rect, raster_scale, images);
 }
 
@@ skipping 50 matching lines @@
 }
 
 scoped_refptr<DisplayListRasterSource>
 DisplayListRasterSource::CreateCloneWithoutLCDText() const {
   bool can_use_lcd_text = false;
   return scoped_refptr<DisplayListRasterSource>(
       new DisplayListRasterSource(this, can_use_lcd_text));
 }
 
 }  // namespace cc