Blob creation methods for ImageBitmap.

Source/core/page/ImageBitmap.cpp

Index: Source/core/page/ImageBitmap.cpp
diff --git a/Source/core/page/ImageBitmap.cpp b/Source/core/page/ImageBitmap.cpp
index ffe3af0dfa65d59ae71c04122efe6fad942d5949..80c379fa68f0334b94a9fd0f19839336fa7b6eea 100644
--- a/Source/core/page/ImageBitmap.cpp
+++ b/Source/core/page/ImageBitmap.cpp
@@ -119,6 +119,17 @@ ImageBitmap::ImageBitmap(ImageBitmap* bitmap, const IntRect& cropRect)
     ScriptWrappable::init(this);
 }
 
+ImageBitmap::ImageBitmap(Image* image, const IntRect& cropRect)
+    : m_cropRect(cropRect)
+    , m_imageElement(0)
+{
+    IntRect srcRect = intersection(cropRect, IntRect(IntPoint(), image->size()));
+    m_bitmap = cropImage(image, cropRect);
+    m_bitmapRect = IntRect(IntPoint(max(0, -cropRect.x()), max(0, -cropRect.y())),  srcRect.size());
+
+    ScriptWrappable::init(this);
+}
+
 ImageBitmap::~ImageBitmap()
 {
     if (m_imageElement)
@@ -160,6 +171,13 @@ PassRefPtr<ImageBitmap> ImageBitmap::create(ImageBitmap* bitmap, const IntRect&
     return imageBitmap.release();
 }
 
+PassRefPtr<ImageBitmap> ImageBitmap::create(Image* image, const IntRect& cropRect)
+{
+    IntRect normalizedCropRect = normalizeRect(cropRect);
+    RefPtr<ImageBitmap> imageBitmap(adoptRef(new ImageBitmap(image, normalizedCropRect)));

[do-not-use, 2013/08/12 21:46:19]

nit: Useless local variable. We can return adoptRef(new ImageBitmap(image,
normalizedCr opRect)); directly.

+    return imageBitmap.release();
+}
+
 void ImageBitmap::notifyImageSourceChanged()
 {
     m_bitmap = cropImage(m_imageElement->cachedImage()->image(), m_cropRect);