Mark SkPictureRecorder::endRecording as SK_WARN_UNUSED_RESULT.

include/core/SkPictureRecorder.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPictureRecorder_DEFINED
 #define SkPictureRecorder_DEFINED
 
@@ skipping 49 matching lines @@
     /**
      *  Signal that the caller is done recording. This invalidates the canvas returned by
      *  beginRecording/getRecordingCanvas. Ownership of the object is passed to the caller, who
      *  must call unref() when they are done using it.
      *
      *  The returned picture is immutable. If during recording drawables were added to the canvas,
      *  these will have been "drawn" into a recording canvas, so that this resulting picture will
      *  reflect their current state, but will not contain a live reference to the drawables
      *  themselves.
      */
-    SkPicture* endRecordingAsPicture();
+    SkPicture* SK_WARN_UNUSED_RESULT endRecordingAsPicture();
 
     /**
      *  Signal that the caller is done recording. This invalidates the canvas returned by
      *  beginRecording/getRecordingCanvas. Ownership of the object is passed to the caller, who
      *  must call unref() when they are done using it.
      *
      *  Unlike endRecordingAsPicture(), which returns an immutable picture, the returned drawable
      *  may contain live references to other drawables (if they were added to the recording canvas)
      *  and therefore this drawable will reflect the current state of those nested drawables anytime
      *  it is drawn or a new picture is snapped from it (by calling drawable->newPictureSnapshot()).
      */
-    SkDrawable* endRecordingAsDrawable();
+    SkDrawable* SK_WARN_UNUSED_RESULT endRecordingAsDrawable();
 
     // Legacy API -- use endRecordingAsPicture instead.
-    SkPicture* endRecording() { return this->endRecordingAsPicture(); }
+    SkPicture* SK_WARN_UNUSED_RESULT endRecording() { return this->endRecordingAsPicture(); }
 
 private:
     void reset();
 
     /** Replay the current (partially recorded) operation stream into
         canvas. This call doesn't close the current recording.
     */
 #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
     friend class android::Picture;
 #endif
     friend class SkPictureRecorderReplayTester; // for unit testing
     void partialReplay(SkCanvas* canvas) const;
 
     bool                          fActivelyRecording;
     uint32_t                      fFlags;
     SkRect                        fCullRect;
     SkAutoTUnref<SkBBoxHierarchy> fBBH;
     SkAutoTUnref<SkRecorder>      fRecorder;
     SkAutoTUnref<SkRecord>        fRecord;
 
     typedef SkNoncopyable INHERITED;
 };
 
 #endif