Rework timeline/frame scheduling logic for SVGImage

third_party/WebKit/Source/core/svg/graphics/SVGImageChromeClient.h

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 11 matching lines @@
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef SVGImageChromeClient_h
 #define SVGImageChromeClient_h
 
+#include "base/gtest_prod_util.h"
+#include "core/CoreExport.h"
 #include "core/loader/EmptyClients.h"
 #include "platform/Timer.h"
 
 namespace blink {
 
 class SVGImage;
 
-class SVGImageChromeClient final : public EmptyChromeClient {
+class CORE_EXPORT SVGImageChromeClient final : public EmptyChromeClient {
 public:
     static SVGImageChromeClient* create(SVGImage*);
 
     bool isSVGImageChromeClient() const override;
 
     SVGImage* image() const { return m_image; }
 
+    void suspendAnimation();
+    void resumeAnimation();
+    bool isSuspended() const { return m_timelineState >= Suspended; }
+
 private:
     explicit SVGImageChromeClient(SVGImage*);
 
     void chromeDestroyed() override;
     void invalidateRect(const IntRect&) override;
     void scheduleAnimation(Widget*) override;
 
+    void setTimer(Timer<SVGImageChromeClient>*);
     void animationTimerFired(Timer<SVGImageChromeClient>*);
 
     SVGImage* m_image;
-    Timer<SVGImageChromeClient> m_animationTimer;
+    OwnPtr<Timer<SVGImageChromeClient>> m_animationTimer;
+    enum {
+        Running,
+        Suspended,
+        SuspendedWithAnimationPending,
+    } m_timelineState;
+
+    FRIEND_TEST_ALL_PREFIXES(SVGImageTest, TimelineSuspendAndResume);
+    FRIEND_TEST_ALL_PREFIXES(SVGImageTest, ResetAnimation);
 };
 
 DEFINE_TYPE_CASTS(SVGImageChromeClient, ChromeClient, client, client->isSVGImageChromeClient(), client.isSVGImageChromeClient());
 
 } // namespace blink
 
 #endif // SVGImageChromeClient_h