android_webview: Let AwContents manage TouchHandleDrawable

content/public/browser/android/synchronous_compositor_client.h

Index: content/public/browser/android/synchronous_compositor_client.h
diff --git a/content/public/browser/android/synchronous_compositor_client.h b/content/public/browser/android/synchronous_compositor_client.h
index eaa5cc515c51aa4606c7ebbe9000ed7e288f357a..cbe47ebc0572759d452f75c05a312327696826d5 100644
--- a/content/public/browser/android/synchronous_compositor_client.h
+++ b/content/public/browser/android/synchronous_compositor_client.h
@@ -11,6 +11,10 @@
 #include "ui/gfx/geometry/size_f.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 
+namespace ui {
+class TouchHandleDrawable;
+}
+
 namespace content {
 
 class SynchronousCompositor;
@@ -49,6 +53,8 @@ class SynchronousCompositorClient {
 
   virtual void DidUpdateContent(SynchronousCompositor* compositor) = 0;
 
+  virtual ui::TouchHandleDrawable* CreateDrawable() = 0;
+
  protected:
   SynchronousCompositorClient() {}
   virtual ~SynchronousCompositorClient() {}