Resolve flakiness in atoms tests.

Extends timeouts to resolve flakiness in history_test, inject_test, and
mouse_test.

Verified for 1000 runs of Chrome on Windows 7.

Signed-off-by: Jason Juang <juangj@google.com>

Author: joshbruning

javascript/atoms/test/history_test.html

@@ -66,7 +66,7 @@
   }
 
   function setUpPage() {
-    goog.testing.TestCase.getActiveTestCase().promiseTimeout = 10000; // 10s
+    goog.testing.TestCase.getActiveTestCase().promiseTimeout = 30000; // 30s
   }
 
   function setUp() {

javascript/atoms/test/inject_test.html

@@ -44,6 +44,10 @@
 
     var frame, frameWin, frameDoc;
 
+    function setUpPage() {
+      goog.testing.TestCase.getActiveTestCase().promiseTimeout = 30000; // 30s
+    }
+
     function setUp() {
       frame = goog.dom.$('test-frame');
       frameWin = goog.dom.getFrameContentWindow(frame);

javascript/atoms/test/mouse_test.html

@@ -60,6 +60,7 @@
     redDiv = bot.locators.findElement({id: 'red'});
     captureDiv = bot.locators.findElement({id: 'capture'});
     innerCaptureDiv = bot.locators.findElement({id: 'innerCapture'});
+    goog.testing.TestCase.getActiveTestCase().promiseTimeout = 30000; // 30s
   }
 
   function setUp() {