Moving TestRunnerForSpecificView into a separate compilation unit.

components/test_runner/test_common.h

Index: components/test_runner/test_common.h
diff --git a/components/test_runner/test_common.h b/components/test_runner/test_common.h
index 57e9747f989dc570affd66e27d5bd5379defe905..c8477baafbb1291a9a70bb7ca957c670c92ee6ea 100644
--- a/components/test_runner/test_common.h
+++ b/components/test_runner/test_common.h
@@ -9,7 +9,9 @@
 
 #include "base/strings/string_util.h"
 #include "components/test_runner/test_runner_export.h"
+#include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/web/WebNavigationPolicy.h"
+#include "v8/include/v8.h"
 
 class GURL;
 
@@ -29,6 +31,8 @@ std::string URLDescription(const GURL& url);
 const char* WebNavigationPolicyToString(
     const blink::WebNavigationPolicy& policy);
 
+blink::WebString V8StringToWebString(v8::Local<v8::String> v8_str);
+
 // Tests which depend on Blink must call this function on the main thread
 // before creating/calling any Blink objects/APIs.
 TEST_RUNNER_EXPORT void EnsureBlinkInitialized();