Expose array of bitmaps contained by gfx::Image similar to NSImage

ui/gfx/canvas.cc

Index: ui/gfx/canvas.cc
diff --git a/ui/gfx/canvas.cc b/ui/gfx/canvas.cc
index 883a7ce175bd748529807ef6f037a7c8e7dd7672..288d19256652b4f53ed2a00a3f1e8ffc76ea2a09 100644
--- a/ui/gfx/canvas.cc
+++ b/ui/gfx/canvas.cc
@@ -278,6 +278,18 @@ void Canvas::DrawBitmapInt(const SkBitmap& bitmap,
                            int dest_x, int dest_y, int dest_w, int dest_h,
                            bool filter,
                            const SkPaint& paint) {
+  DrawBitmapFloat(bitmap, static_cast<float>(src_x), static_cast<float>(src_y),
+                  static_cast<float>(src_w), static_cast<float>(src_h),
+                  static_cast<float>(dest_x), static_cast<float>(dest_y),
+                  static_cast<float>(dest_w), static_cast<float>(dest_h),
+                  filter, paint);
+}
+
+void Canvas::DrawBitmapFloat(const SkBitmap& bitmap,
+    float src_x, float src_y, float src_w, float src_h,
+    float dest_x, float dest_y, float dest_w, float dest_h,
+    bool filter,
+    const SkPaint& paint) {
   DLOG_ASSERT(src_x + src_w < std::numeric_limits<int16_t>::max() &&
               src_y + src_h < std::numeric_limits<int16_t>::max());
   if (src_w <= 0 || src_h <= 0) {
@@ -288,10 +300,10 @@ void Canvas::DrawBitmapInt(const SkBitmap& bitmap,
   if (!IntersectsClipRectInt(dest_x, dest_y, dest_w, dest_h))
     return;
 
-  SkRect dest_rect = { SkIntToScalar(dest_x),
-                       SkIntToScalar(dest_y),
-                       SkIntToScalar(dest_x + dest_w),
-                       SkIntToScalar(dest_y + dest_h) };
+  SkRect dest_rect = { SkFloatToScalar(dest_x),
+                       SkFloatToScalar(dest_y),
+                       SkFloatToScalar(dest_x + dest_w),
+                       SkFloatToScalar(dest_y + dest_h) };
 
   if (src_w == dest_w && src_h == dest_h) {
     // Workaround for apparent bug in Skia that causes image to occasionally
@@ -309,10 +321,10 @@ void Canvas::DrawBitmapInt(const SkBitmap& bitmap,
                                                   SkShader::kRepeat_TileMode,
                                                   SkShader::kRepeat_TileMode);
   SkMatrix shader_scale;
-  shader_scale.setScale(SkFloatToScalar(static_cast<float>(dest_w) / src_w),
-                        SkFloatToScalar(static_cast<float>(dest_h) / src_h));
-  shader_scale.preTranslate(SkIntToScalar(-src_x), SkIntToScalar(-src_y));
-  shader_scale.postTranslate(SkIntToScalar(dest_x), SkIntToScalar(dest_y));
+  shader_scale.setScale(SkFloatToScalar(dest_w / src_w),
+                        SkFloatToScalar(dest_h / src_h));
+  shader_scale.preTranslate(SkFloatToScalar(-src_x), SkFloatToScalar(-src_y));
+  shader_scale.postTranslate(SkFloatToScalar(dest_x), SkFloatToScalar(dest_y));
   shader->setLocalMatrix(shader_scale);
 
   // Set up our paint to use the shader & release our reference (now just owned