input: Restrict synthetic touch gesture to view bounds.

content/browser/renderer_host/input/synthetic_gesture_target.h

Index: content/browser/renderer_host/input/synthetic_gesture_target.h
diff --git a/content/browser/renderer_host/input/synthetic_gesture_target.h b/content/browser/renderer_host/input/synthetic_gesture_target.h
index da44ba2e3be5c3349ca5765ce8a02c40390da3a0..2558771b31b55f07f37fc9f01d09d771b4be0c8c 100644
--- a/content/browser/renderer_host/input/synthetic_gesture_target.h
+++ b/content/browser/renderer_host/input/synthetic_gesture_target.h
@@ -8,6 +8,7 @@
 #include "base/time/time.h"
 #include "content/common/content_export.h"
 #include "content/common/input/synthetic_gesture_params.h"
+#include "ui/gfx/geometry/size.h"
 
 namespace blink {
 class WebInputEvent;
@@ -46,6 +47,8 @@ class CONTENT_EXPORT SyntheticGestureTarget {
   // Returns the minimum number of DIPs two touch pointers have to be apart
   // to perform a pinch-zoom.
   virtual float GetMinScalingSpanInDips() const = 0;
+
+  virtual gfx::Size GetViewSize() const = 0;
 };
 
 }  // namespace content