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

cc/base/switches.cc

 // Copyright (c) 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/base/switches.h"
 
 #include "base/command_line.h"
 
 namespace cc {
 namespace switches {
@@ skipping 58 matching lines @@
 // The scale factor for low resolution tile contents.
 const char kLowResolutionContentsScaleFactor[] =
     "low-resolution-contents-scale-factor";
 
 // Max distance from visible for prepaint tiles.
 const char kMaxPrepaintTileDistance[] = "max-prepaint-tile-distance";
 
 // Max tiles allowed for each tilings interest area.
 const char kMaxTilesForInterestArea[] = "max-tiles-for-interest-area";
 
+// The amount of unused resource memory compositor is allowed to keep around.
+const char kMaxUnusedResourceMemoryUsagePercentage[] =
+    "max-unused-resource-memory-usage-percentage";
+
 // Causes the compositor to render to textures which are then sent to the parent
 // through the texture mailbox mechanism.
 // Requires --enable-compositor-frame-message.
 const char kCompositeToMailbox[] = "composite-to-mailbox";
 
 const char kEnablePartialSwap[] = "enable-partial-swap";
 const char kUIEnablePartialSwap[] = "ui-enable-partial-swap";
 
 const char kEnablePerTilePainting[] = "enable-per-tile-painting";
 const char kUIEnablePerTilePainting[] = "ui-enable-per-tile-painting";
@@ skipping 52 matching lines @@
 
 #if defined(OS_ANDROID)
   return true;
 #else
   return false;
 #endif
 }
 
 }  // namespace switches
 }  // namespace cc