cc: Add command line switch to control resource usage for impl-side painting.

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 <string>
 
 #include "base/bind.h"
@@ skipping 180 matching lines @@
   raster_worker_pool_.reset();
   AbortPendingTileUploads();
   DCHECK_EQ(tiles_with_pending_upload_.size(), 0);
   DCHECK_EQ(all_tiles_.size(), 0);
   DCHECK_EQ(live_or_allocated_tiles_.size(), 0);
 }
 
 void TileManager::SetGlobalState(
     const GlobalStateThatImpactsTilePriority& global_state) {
   global_state_ = global_state;
-  resource_pool_->SetMaxMemoryUsageBytes(global_state_.memory_limit_in_bytes);
+  resource_pool_->SetMaxMemoryUsageBytes(
+      global_state_.memory_limit_in_bytes,
+      global_state_.unused_memory_limit_in_bytes);
   ScheduleManageTiles();
   UpdateCheapTasksTimeLimit();
 }
 
 void TileManager::RegisterTile(Tile* tile) {
   all_tiles_.insert(tile);
 
   const ManagedTileState& mts = tile->managed_state();
   for (int i = 0; i < NUM_TREES; ++i)
     ++raster_state_count_[mts.raster_state][i][mts.tree_bin[i]];
@@ skipping 901 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