Improve modules' TypeError exception messages.

Source/modules/imagebitmap/ImageBitmapFactories.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 65 matching lines @@
     LayoutSize s = sizeFor(image);
     return createImageBitmap(eventTarget, image, 0, 0, s.width(), s.height(), exceptionState);
 }
 
 ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget* eventTarget, HTMLImageElement* image, int sx, int sy, int sw, int sh, ExceptionState& exceptionState)
 {
     // This variant does not work in worker threads.
     ASSERT(eventTarget->toDOMWindow());
 
     if (!image) {
-        exceptionState.throwUninformativeAndGenericTypeError();
+        exceptionState.throwTypeError("The image element provided is invalid.");
         return ScriptPromise();
     }
     if (!image->cachedImage()) {
         exceptionState.throwUninformativeAndGenericDOMException(InvalidStateError);
         return ScriptPromise();
     }
     if (image->cachedImage()->image()->isSVGImage()) {
         exceptionState.throwUninformativeAndGenericDOMException(InvalidStateError);
         return ScriptPromise();
     }
@@ skipping 19 matching lines @@
     IntSize s = sizeFor(video);
     return createImageBitmap(eventTarget, video, 0, 0, s.width(), s.height(), exceptionState);
 }
 
 ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget* eventTarget, HTMLVideoElement* video, int sx, int sy, int sw, int sh, ExceptionState& exceptionState)
 {
     // This variant does not work in worker threads.
     ASSERT(eventTarget->toDOMWindow());
 
     if (!video) {
-        exceptionState.throwUninformativeAndGenericTypeError();
+        exceptionState.throwTypeError("The video element provided is invalid.");
         return ScriptPromise();
     }
     if (!video->player()) {
         exceptionState.throwUninformativeAndGenericDOMException(InvalidStateError);
         return ScriptPromise();
     }
     if (video->networkState() == HTMLMediaElement::NETWORK_EMPTY) {
         exceptionState.throwUninformativeAndGenericDOMException(InvalidStateError);
         return ScriptPromise();
     }
@@ skipping 31 matching lines @@
 {
     return createImageBitmap(eventTarget, canvas, 0, 0, canvas->width(), canvas->height(), exceptionState);
 }
 
 ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget* eventTarget, HTMLCanvasElement* canvas, int sx, int sy, int sw, int sh, ExceptionState& exceptionState)
 {
     // This variant does not work in worker threads.
     ASSERT(eventTarget->toDOMWindow());
 
     if (!canvas) {
-        exceptionState.throwUninformativeAndGenericTypeError();
+        exceptionState.throwTypeError("The canvas element provided is invalid.");
         return ScriptPromise();
     }
     if (!canvas->originClean()) {
         exceptionState.throwUninformativeAndGenericDOMException(InvalidStateError);
         return ScriptPromise();
     }
     if (!sw || !sh) {
         exceptionState.throwUninformativeAndGenericDOMException(IndexSizeError);
         return ScriptPromise();
     }
@@ skipping 34 matching lines @@
 }
 
 ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget* eventTarget, ImageData* data, ExceptionState& exceptionState)
 {
     return createImageBitmap(eventTarget, data, 0, 0, data->width(), data->height(), exceptionState);
 }
 
 ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget* eventTarget, ImageData* data, int sx, int sy, int sw, int sh, ExceptionState& exceptionState)
 {
     if (!data) {
-        exceptionState.throwUninformativeAndGenericTypeError();
+        exceptionState.throwTypeError("The ImageData provided is invalid.");
         return ScriptPromise();
     }
     if (!sw || !sh) {
         exceptionState.throwUninformativeAndGenericDOMException(IndexSizeError);
         return ScriptPromise();
     }
     // FIXME: make ImageBitmap creation asynchronous crbug.com/258082
     return fulfillImageBitmap(eventTarget->executionContext(), ImageBitmap::create(data, IntRect(sx, sy, sw, sh)));
 }
 
 ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget* eventTarget, ImageBitmap* bitmap, ExceptionState& exceptionState)
 {
     return createImageBitmap(eventTarget, bitmap, 0, 0, bitmap->width(), bitmap->height(), exceptionState);
 }
 
 ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget* eventTarget, ImageBitmap* bitmap, int sx, int sy, int sw, int sh, ExceptionState& exceptionState)
 {
     if (!bitmap) {
-        exceptionState.throwUninformativeAndGenericTypeError();
+        exceptionState.throwTypeError("The ImageBitmap provided is invalid.");
         return ScriptPromise();
     }
     if (!sw || !sh) {
         exceptionState.throwUninformativeAndGenericDOMException(IndexSizeError);
         return ScriptPromise();
     }
     // FIXME: make ImageBitmap creation asynchronous crbug.com/258082
     return fulfillImageBitmap(eventTarget->executionContext(), ImageBitmap::create(bitmap, IntRect(sx, sy, sw, sh)));
 }
 
@@ skipping 86 matching lines @@
     m_resolver->resolve(imageBitmap.release());
     m_factory->didFinishLoading(this);
 }
 
 void ImageBitmapFactories::ImageBitmapLoader::didFail(FileError::ErrorCode)
 {
     rejectPromise();
 }
 
 } // namespace WebCore