Make Android WebView filtering depend on scrolling status.

This patch makes bilinear filtering of software images enabled only when
there is no scrolling or CSS animation active, which matches the
policy of classic WebView.  In the long run, we'll likely want to support
software tiling to avoid this kind of hack, but for now this maintains
bugwards compatibility.

Most of this patch is to solve the problem that CC was not aware whether
or not WebView-handled fling is active.  I added a new getter 
ScrollOffsetDelegate::IsExternalFlingActive for this.  This also
enables prefer-smoothness mode for these flings.

New test RendererPixelTest.PictureDrawQuadDisableImageFiltering

NOTRY=true
BUG= internal b/10706494

Review URL: https://codereview.chromium.org/25233002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227629 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 15 insertions, 3 deletions

diff --git a/cc/test/fake_content_layer_client.h b/cc/test/fake_content_layer_client.h
index ff42855..6afa5b6 100644
--- a/cc/test/fake_content_layer_client.h
+++ b/cc/test/fake_content_layer_client.h
@@ -18,6 +18,12 @@ namespace cc {
 
 class FakeContentLayerClient : public cc::ContentLayerClient {
  public:
+  struct BitmapData {
+    SkBitmap bitmap;
+    gfx::Point point;
+    SkPaint paint;
+  };
+
   FakeContentLayerClient();
   virtual ~FakeContentLayerClient();
 
@@ -32,13 +38,19 @@ class FakeContentLayerClient : public cc::ContentLayerClient {
     draw_rects_.push_back(std::make_pair(rect, paint));
   }
 
-  void add_draw_bitmap(const SkBitmap& bitmap, gfx::Point point) {
-    draw_bitmaps_.push_back(std::make_pair(bitmap, point));
+  void add_draw_bitmap(const SkBitmap& bitmap,
+                       gfx::Point point,
+                       const SkPaint& paint) {
+    BitmapData data;
+    data.bitmap = bitmap;
+    data.point = point;
+    data.paint = paint;
+    draw_bitmaps_.push_back(data);
   }
 
  private:
   typedef std::vector<std::pair<gfx::RectF, SkPaint> > RectPaintVector;
-  typedef std::vector<std::pair<SkBitmap, gfx::Point> > BitmapVector;
+  typedef std::vector<BitmapData> BitmapVector;
 
   bool paint_all_opaque_;
   RectPaintVector draw_rects_;