API functions returning Promises should not throw exceptions.

Source/bindings/core/v8/ScriptPromise.h

Index: Source/bindings/core/v8/ScriptPromise.h
diff --git a/Source/bindings/core/v8/ScriptPromise.h b/Source/bindings/core/v8/ScriptPromise.h
index 8d87a4dc78e0264cc07218146176f13d26762606..c912661f62053b0beb08c71102ab45fbcd013de7 100644
--- a/Source/bindings/core/v8/ScriptPromise.h
+++ b/Source/bindings/core/v8/ScriptPromise.h
@@ -33,14 +33,17 @@
 
 #include "bindings/core/v8/ScriptFunction.h"
 #include "bindings/core/v8/ScriptValue.h"
+#include "bindings/core/v8/V8ThrowException.h"
 #include "platform/heap/Handle.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/PassRefPtr.h"
+#include "wtf/text/WTFString.h"
 #include <v8.h>
 
 namespace blink {
 
 class DOMException;
+class ExceptionState;
 
 // ScriptPromise is the class for representing Promise values in C++ world.
 // ScriptPromise holds a Promise.
@@ -115,6 +118,23 @@ public:
 
     static ScriptPromise rejectWithDOMException(ScriptState*, PassRefPtrWillBeRawPtr<DOMException>);
 
+    // static functions each of which returns a ScriptPromise rejected with
+    // the given error.
+    // They coresspond to functions in V8Binding.h, such as throwError,
+    // throwTypeError, etc.
+    static ScriptPromise rejectWithError(ScriptState*, V8ErrorType, const String&);
+    static ScriptPromise rejectWithTypeError(ScriptState*, const String&);
+    static ScriptPromise rejectWithArityTypeErrorForMethod(ScriptState*, const char* method, const char* type, const char* valid, unsigned provided);
+    static ScriptPromise rejectWithArityTypeErrorForConstructor(ScriptState*, const char* type, const char* valid, unsigned provided);
+    static ScriptPromise rejectWithArityTypeError(ScriptState*, ExceptionState&, const char* valid, unsigned provided);
+    static ScriptPromise rejectWithMinimumArityTypeErrorForMethod(
+        ScriptState*, const char* method, const char* type, unsigned expected, unsigned providedLeastNumMandatoryParams);
+    static ScriptPromise rejectWithMinimumArityTypeErrorForConstructor(
+        ScriptState*, const char* type, unsigned expected, unsigned providedLeastNumMandatoryParams);
+    static ScriptPromise rejectWithMinimumArityTypeError(ScriptState*, ExceptionState&, unsigned expected, unsigned providedLeastNumMandatoryParams);
+
+    static v8::Local<v8::Promise> rejectRaw(v8::Isolate*, v8::Handle<v8::Value>);
+
     // This is a utility class intended to be used internally.
     // ScriptPromiseResolver is for general purpose.
     class InternalResolver FINAL {