Implement on demand quad rasterization for PicturePiles.

cc/resources/tile_manager.cc

 // Copyright 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.
 
 #include "cc/resources/tile_manager.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
@@ skipping 573 matching lines @@
       mts.can_use_gpu_memory = false;
       FreeResourcesForTile(tile);
       continue;
     }
     if (tile_bytes > bytes_left) {
       mts.can_use_gpu_memory = false;
       if (mts.bin[HIGH_PRIORITY_BIN] == NOW_BIN ||
           mts.bin[LOW_PRIORITY_BIN] == NOW_BIN)
           bytes_that_exceeded_memory_budget_in_now_bin += tile_bytes;
       FreeResourcesForTile(tile);
+      tile->drawing_info().set_rasterize_on_demand();
       continue;
     }
+    tile->drawing_info().set_texture();
     bytes_left -= tile_bytes;
     mts.can_use_gpu_memory = true;
     if (!mts.drawing_info.resource_ &&
         !mts.drawing_info.resource_is_being_initialized_) {
       tiles_that_need_to_be_rasterized_.push_back(tile);
       DidTileRasterStateChange(tile, WAITING_FOR_RASTER_STATE);
     }
   }
 
   ever_exceeded_memory_budget_ |=
@@ skipping 481 matching lines @@
     skia::LazyPixelRef* pixel_ref,
     RenderingStatsInstrumentation* stats_instrumentation) {
   TRACE_EVENT0("cc", "TileManager::RunImageDecodeTask");
   base::TimeTicks start_time = stats_instrumentation->StartRecording();
   pixel_ref->Decode();
   base::TimeDelta duration = stats_instrumentation->EndRecording(start_time);
   stats_instrumentation->AddDeferredImageDecode(duration);
 }
 
 }  // namespace cc