Add command line switches and about:flag to enable FPS indicator and compositor layer tree.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 2fb2ebaa471a8dbad50bc61b45516a859d68222f..ee57d750cfbdeb06701c6baf31e175bf362ba9e3 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -4020,6 +4020,12 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_FLAGS_COMPOSITED_LAYER_BORDERS_DESCRIPTION" desc="Description of the 'Composited layer borders' lab.">
         Renders a border around composited Render Layers to help debug and study layer compositing.
       </message>
+      <message name="IDS_FLAGS_SHOW_FPS_COUNTER" desc="Name of the 'Show FPS counter lab.">
+        FPS counter.
+      </message>
+      <message name="IDS_FLAGS_SHOW_FPS_COUNTER_DESCRIPTION" desc="Description of the 'Show FPS counter' lab.">
+        Shows a page's actual frame rate, in frames per second, when hardware acceleration is active.
+      </message>
       <message name="IDS_FLAGS_ACCELERATED_CANVAS_2D_NAME" desc="Name of the 'GPU Accelerated Canvas 2D' lab.">
         GPU Accelerated Canvas 2D
       </message>