Refactors code for WebGestureCurve to ui/events/gestures/blink

mojo/services/html_viewer/blink_platform_impl.h

Index: mojo/services/html_viewer/blink_platform_impl.h
diff --git a/mojo/services/html_viewer/blink_platform_impl.h b/mojo/services/html_viewer/blink_platform_impl.h
index fc77e7e9847aa626ade52da9e9b510ca4a2e4698..17cca38942d4161b02f4269f23281401dc31275e 100644
--- a/mojo/services/html_viewer/blink_platform_impl.h
+++ b/mojo/services/html_viewer/blink_platform_impl.h
@@ -57,6 +57,10 @@ class BlinkPlatformImpl : public blink::Platform {
   const unsigned char* getTraceCategoryEnabledFlag(
       const char* category_name) override;
   blink::WebData loadResource(const char* name) override;
+  blink::WebGestureCurve* createFlingAnimationCurve(
+      blink::WebGestureDevice device_source,
+      const blink::WebFloatPoint& velocity,
+      const blink::WebSize& cumulative_scroll) override;
 
  private:
   void SuspendSharedTimer();