Add initial framework for performance tests that measure frame rate.

chrome/test/ui/javascript_test_util.cc

Index: chrome/test/ui/javascript_test_util.cc
===================================================================
--- chrome/test/ui/javascript_test_util.cc	(revision 85645)
+++ chrome/test/ui/javascript_test_util.cc	(working copy)
@@ -6,6 +6,7 @@
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "content/common/json_value_serializer.h"
@@ -38,17 +39,28 @@
     if (!succeeded)
       continue;
 
-    EXPECT_TRUE(value->IsType(Value::TYPE_STRING));
-    if (value->IsType(Value::TYPE_STRING)) {
-      const std::string& key(*it);
+    const std::string& key(*it);
+    std::string result;
 
-      std::string result;
-      succeeded = value->GetAsString(&result);
-      EXPECT_TRUE(succeeded);
+    switch (value->GetType()) {
+      case Value::TYPE_STRING:
+        succeeded = value->GetAsString(&result);
+        break;
+      case Value::TYPE_DOUBLE: {
+        double double_result;
+        succeeded = value->GetAsDouble(&double_result);
+        if (succeeded)
+          result = base::DoubleToString(double_result);
+        break;
+      }
+      default:
+        NOTREACHED() << "Value type not supported!";
+        return false;
+    }
 
-      if (succeeded)
-        results->insert(std::make_pair(key, result));
-    }
+    EXPECT_TRUE(succeeded);
+    if (succeeded)
+      results->insert(std::make_pair(key, result));
   }
 
   return true;