Remove SkCanvas::flush() and related code from RecordingCanvas

In http://review.skia.org/716476, Skia removed SkCanvas::flush()
and SkCanvas::onFlush().

Flushing is handled externally in SkiaOpenGLPipeline::draw() so
there's no need to record it in the DisplayListData.


Change-Id: I04e71041841d9d9f60acce3fe299cd643d8ae8ea

libs/hwui/DisplayListOps.in

@@ -14,7 +14,6 @@
  * limitations under the License.
  */
 
-X(Flush)
 X(Save)
 X(Restore)
 X(SaveLayer)

libs/hwui/RecordingCanvas.cpp

@@ -107,11 +107,6 @@ struct Op {
 };
 static_assert(sizeof(Op) == 4, "");
 
-struct Flush final : Op {
-    static const auto kType = Type::Flush;
-    void draw(SkCanvas* c, const SkMatrix&) const { c->flush(); }
-};
-
 struct Save final : Op {
     static const auto kType = Type::Save;
     void draw(SkCanvas* c, const SkMatrix&) const { c->save(); }
@@ -751,10 +746,6 @@ inline void DisplayListData::map(const Fn fns[], Args... args) const {
     }
 }
 
-void DisplayListData::flush() {
-    this->push<Flush>(0);
-}
-
 void DisplayListData::save() {
     this->push<Save>(0);
 }
@@ -1046,10 +1037,6 @@ sk_sp<SkSurface> RecordingCanvas::onNewSurface(const SkImageInfo&, const SkSurfa
     return nullptr;
 }
 
-void RecordingCanvas::onFlush() {
-    fDL->flush();
-}
-
 void RecordingCanvas::willSave() {
     mSaveCount++;
     fDL->save();

libs/hwui/RecordingCanvas.h

@@ -127,8 +127,6 @@ public:
 private:
     friend class RecordingCanvas;
 
-    void flush();
-
     void save();
     void saveLayer(const SkRect*, const SkPaint*, const SkImageFilter*, SkCanvas::SaveLayerFlags);
     void saveBehind(const SkRect*);
@@ -208,8 +206,6 @@ public:
     void willRestore() override;
     bool onDoSaveBehind(const SkRect*) override;
 
-    void onFlush() override;
-
     void didConcat44(const SkM44&) override;
     void didSetM44(const SkM44&) override;
     void didScale(SkScalar, SkScalar) override;