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

content/renderer/gpu/render_widget_compositor.cc

 // Copyright (c) 2013 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 "content/renderer/gpu/render_widget_compositor.h"
 
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 239 matching lines @@
 
   if (cmd->HasSwitch(cc::switches::kMaxTilesForInterestArea)) {
     int max_tiles_for_interest_area;
     if (GetSwitchValueAsInt(*cmd,
                             cc::switches::kMaxTilesForInterestArea,
                             1, std::numeric_limits<int>::max(),
                             &max_tiles_for_interest_area))
       settings.max_tiles_for_interest_area = max_tiles_for_interest_area;
   }
 
+  if (cmd->HasSwitch(cc::switches::kMaxUnusedResourceMemoryUsagePercentage)) {
+    int max_unused_resource_memory_percentage;
+    if (GetSwitchValueAsInt(
+            *cmd,
+            cc::switches::kMaxUnusedResourceMemoryUsagePercentage,
+            0, 100,
+            &max_unused_resource_memory_percentage)) {
+      settings.max_unused_resource_memory_percentage =
+          max_unused_resource_memory_percentage;
+    }
+  }
+
 #if defined(OS_ANDROID)
   // TODO(danakj): Move these to the android code.
   settings.can_use_lcd_text = false;
   settings.max_partial_texture_updates = 0;
   settings.use_linear_fade_scrollbar_animator = true;
   settings.solid_color_scrollbars = true;
   settings.solid_color_scrollbar_color = SkColorSetARGB(128, 128, 128, 128);
   settings.solid_color_scrollbar_thickness_dip = 3;
 #endif
 
@@ skipping 265 matching lines @@
   return RenderThreadImpl::current()->OffscreenContextProviderForMainThread();
 }
 
 scoped_refptr<cc::ContextProvider>
 RenderWidgetCompositor::OffscreenContextProviderForCompositorThread() {
   return RenderThreadImpl::current()->
       OffscreenContextProviderForCompositorThread();
 }
 
 }  // namespace content