cc: Add image decode control in the compositor.

cc/playback/discardable_image_map.cc

Index: cc/playback/discardable_image_map.cc
diff --git a/cc/playback/discardable_image_map.cc b/cc/playback/discardable_image_map.cc
index 133347544febde0358e421249e3a8bdc9757efd8..60a3f3ca1f20e9dfe5eb18bab4acae1eea962f06 100644
--- a/cc/playback/discardable_image_map.cc
+++ b/cc/playback/discardable_image_map.cc
@@ -23,13 +23,15 @@ SkRect MapRect(const SkMatrix& matrix, const SkRect& src) {
   return dst;
 }
 
-SkSize ExtractScale(const SkMatrix& matrix) {
-  SkSize scale = SkSize::Make(matrix.getScaleX(), matrix.getScaleY());
+bool ExtractScale(const SkMatrix& matrix, SkSize* scale) {
+  *scale = SkSize::Make(matrix.getScaleX(), matrix.getScaleY());
   if (matrix.getType() & SkMatrix::kAffine_Mask) {
-    if (!matrix.decomposeScale(&scale))
-      scale.set(1, 1);
+    if (!matrix.decomposeScale(scale)) {
+      scale->set(1, 1);
+      return false;
+    }
   }
-  return scale;
+  return true;
 }
 
 // We're using an NWay canvas with no added canvases, so in effect
@@ -97,8 +99,11 @@ class DiscardableImagesMetadataCanvas : public SkNWayCanvas {
       if (paint) {
         filter_quality = paint->getFilterQuality();
       }
+      SkSize scale;
+      bool is_decomposable = ExtractScale(matrix, &scale);
       image_set_->push_back(
-          std::make_pair(DrawImage(image, ExtractScale(matrix), filter_quality),
+          std::make_pair(DrawImage(image, scale, filter_quality,
+                                   matrix.hasPerspective(), is_decomposable),
                          gfx::SkRectToRectF(rect)));
     }
   }