Use auto-rethrowing v8::TryCatch variant

Source/bindings/v8/V8Binding.h

Index: Source/bindings/v8/V8Binding.h
diff --git a/Source/bindings/v8/V8Binding.h b/Source/bindings/v8/V8Binding.h
index 4e093882fb9e78b7b13b8db4ca8340eb4a9426c6..71cde0e3fa3118ff2b41d374cc989a65dc1d244d 100644
--- a/Source/bindings/v8/V8Binding.h
+++ b/Source/bindings/v8/V8Binding.h
@@ -940,6 +940,19 @@ private:
 void GetDevToolsFunctionInfo(v8::Handle<v8::Function>, v8::Isolate*, int& scriptId, String& resourceName, int& lineNumber);
 PassRefPtr<TraceEvent::ConvertableToTraceFormat> devToolsTraceEventData(ExecutionContext*, v8::Handle<v8::Function>, v8::Isolate*);
 
+// TryCatch variant that automatically rethrows caught exceptions.
+// Useful for cases where exceptions need to be detected, but not actually caught.
+class V8TryPropagate : public v8::TryCatch {

[yhirano, 2014/05/30 08:08:43]

How about classes https://codereview.chromium.org/304283004/ ?
I prefer them more because they are nestable.

+public:
+    ~V8TryPropagate()
+    {
+        // ReThrow() is a no-op if no exception has been caught, so always call.
+        v8::TryCatch::ReThrow();
+    }
+
+private:
+    v8::Handle<v8::Value> ReThrow();
+};
 
 } // namespace WebCore