Add SkCanvas::writePixels that takes info+pixels directly

include/core/SkBitmapDevice.h

Index: include/core/SkBitmapDevice.h
diff --git a/include/core/SkBitmapDevice.h b/include/core/SkBitmapDevice.h
index 1d181555e0bd882652e5c199e2a8b34c4c30d540..85896329a0135ce5258671370ebe6e4424f2a4d6 100644
--- a/include/core/SkBitmapDevice.h
+++ b/include/core/SkBitmapDevice.h
@@ -215,9 +215,8 @@ protected:
      *  3. The rectangle (x, y, x + bitmap->width(), y + bitmap->height()) is
      *     contained in the device bounds.
      */
-    virtual bool onReadPixels(const SkBitmap& bitmap,
-                              int x, int y,
-                              SkCanvas::Config8888 config8888) SK_OVERRIDE;
+    virtual bool onReadPixels(const SkBitmap&, int x, int y, SkCanvas::Config8888) SK_OVERRIDE;
+    virtual bool onWritePixelsDirect(const SkImageInfo&, const void*, size_t, int, int) SK_OVERRIDE;
 
     /** Called when this device is installed into a Canvas. Balanced by a call
         to unlockPixels() when the device is removed from a Canvas.