this change improves the following points of the FPS counter:

-cleaner design: less colors, text arranged above the graph, deviation number right aligned 
-added transparency: FPS counter does not completely cover the webpage
-less frequent number updates: makes the numbers easier to read
-indicator line at 60fps

comparison images: https://docs.google.com/folder/d/0B8Y78t3tjy1XZk1xdWx6VjN5aFE/edit

Please download the patch and provide a screenshot from your system to test the layout.

Review URL: https://chromiumcodereview.appspot.com/11272042

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@166041 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 3 insertions, 2 deletions

diff --git a/cc/frame_rate_counter.h b/cc/frame_rate_counter.h
index f9b770a..80697da 100644
--- a/cc/frame_rate_counter.h
+++ b/cc/frame_rate_counter.h
@@ -25,7 +25,8 @@ public:
 
     // n = 0 returns the oldest frame retained in the history,
     // while n = timeStampHistorySize() - 1 returns the timestamp most recent frame.
-    base::TimeTicks timeStampOfRecentFrame(int n);
+    // FIXME: Returns most recent timestamp for n = 0 when called between markBeginningOfFrame and markEndOfFrame calls.
+    base::TimeTicks timeStampOfRecentFrame(int n) const;
 
     // This is a heuristic that can be used to ignore frames in a reasonable way. Returns
     // true if the given frame interval is too fast or too slow, based on constant thresholds.
@@ -51,7 +52,7 @@ private:
     // FIXME: Determine this threshold based on monitor refresh rate, crbug.com/138642.
     static const double kDroppedFrameTime;
 
-    static const int kTimeStampHistorySize = 120;
+    static const int kTimeStampHistorySize = 170;
 
     int m_currentFrameNumber;
     base::TimeTicks m_timeStampHistory[kTimeStampHistorySize];