[cc] Use base::TimeTicks in RenderStats

cc/rendering_stats.h

Index: cc/rendering_stats.h
diff --git a/cc/rendering_stats.h b/cc/rendering_stats.h
index 9424f5538558db42deec4bbf6d579ee2524d362c..f47c71074fbcc73c3545bfb1df3479cabc0e4cab 100644
--- a/cc/rendering_stats.h
+++ b/cc/rendering_stats.h
@@ -16,9 +16,9 @@ struct CC_EXPORT RenderingStats {
     int64 numAnimationFrames;
     int64 numFramesSentToScreen;
     int64 droppedFrameCount;
-    double totalPaintTimeInSeconds;
-    double totalRasterizeTimeInSeconds;
-    double totalCommitTimeInSeconds;
+    base::TimeDelta totalPaintTime;
+    base::TimeDelta totalRasterizeTime;
+    base::TimeDelta totalCommitTime;
     int64 totalCommitCount;
     int64 totalPixelsPainted;
     int64 totalPixelsRasterized;
@@ -29,8 +29,8 @@ struct CC_EXPORT RenderingStats {
     int64 totalDeferredImageDecodeCount;
     int64 totalDeferredImageCacheHitCount;
     int64 totalImageGatheringCount;
-    double totalDeferredImageDecodeTimeInSeconds;
-    double totalImageGatheringTimeInSeconds;
+    base::TimeDelta totalDeferredImageDecodeTime;
+    base::TimeDelta totalImageGatheringTime;
     // Note: when adding new members, please remember to update enumerateFields
     // in rendering_stats.cc.