Add performance tests for accelerated elements with CSS Blending.

PerformanceTests/Blending/resources/framerate.js

Index: PerformanceTests/Blending/resources/framerate.js
diff --git a/PerformanceTests/Blending/resources/framerate.js b/PerformanceTests/Blending/resources/framerate.js
deleted file mode 100644
index 6871eba7df0ff9d1123ef0e928cd03c3c370d843..0000000000000000000000000000000000000000
--- a/PerformanceTests/Blending/resources/framerate.js
+++ /dev/null
@@ -1,38 +0,0 @@
-(function(){
-
-var framesPerTimerReading = 10;
-var frameCount = 0;
-var startTime;
-var trackingFrameRate = false;
-var currentTest;
-
-function trackFrameRate(currTime)
-{
-    if (++frameCount == framesPerTimerReading) {
-        frameCount = 0;
-        PerfTestRunner.measureValueAsync(1000 * framesPerTimerReading / (currTime - startTime));
-        startTime = currTime;
-    }
-
-    if (currentTest && currentTest.run)
-        currentTest.run();
-
-    if (trackingFrameRate)
-        requestAnimationFrame(trackFrameRate);
-}
-
-window.startTrackingFrameRate = function(test) {
-    if (trackingFrameRate)
-        return;
-    trackingFrameRate = true;
-    currentTest = test;
-    startTime = performance.now();
-    trackFrameRate();
-};
-
-window.stopTrackingFrameRate = function() {
-    trackingFrameRate = false;
-    currentTest = undefined;
-};
-
-})();