Update telemetry tests that rely on window.innerWidth/Height.

tools/telemetry/telemetry/internal/actions/gesture_common.js

Index: tools/telemetry/telemetry/internal/actions/gesture_common.js
diff --git a/tools/telemetry/telemetry/internal/actions/gesture_common.js b/tools/telemetry/telemetry/internal/actions/gesture_common.js
index 2e17fa2b69e81fb7f7ccecebc1573a7f27c4d421..d6dcd9c73acb4c83f3fdd0bf428b310f977dc0ad 100644
--- a/tools/telemetry/telemetry/internal/actions/gesture_common.js
+++ b/tools/telemetry/telemetry/internal/actions/gesture_common.js
@@ -39,8 +39,10 @@
       rect.left = 0;
     }
 
-    var outsideHeight = (rect.top + rect.height) - window.innerHeight;
-    var outsideWidth = (rect.left + rect.width) - window.innerWidth;
+    var outsideHeight = (rect.top + rect.height) -
+        chrome.gpuBenchmarking.visualViewportHeight();

[Sami, 2015/10/14 10:44:38]

Some telemetry tests run against older reference builds which won't have these
new properties. Could you write this in a way that works in both cases (with a
TODO to remove the fallback path after once the properties roll into stable)?

/me wonders if the visual viewport dimensions should be exposed to the web
platform too...

[ymalik, 2015/10/14 15:56:10]

Done. 

We do have plans in the future (perhaps next quarter) to expose the visual
viewport dimensions to the web platform. 

+    var outsideWidth = (rect.left + rect.width) -
+        chrome.gpuBenchmarking.visualViewportWidth();
 
     if (outsideHeight > 0) {
       rect.height -= outsideHeight;