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

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index 51878006b74a27395ae6c99d7cc138ea5122e972..4715047d41d98882a4154eb6b5841fdcb4b5738b 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -257,6 +257,18 @@ scoped_ptr<RenderWidgetCompositor> RenderWidgetCompositor::Create(
       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;