android_webview: Let AwContents manage TouchHandleDrawable

android_webview/native/aw_contents.h

Index: android_webview/native/aw_contents.h
diff --git a/android_webview/native/aw_contents.h b/android_webview/native/aw_contents.h
index 12ff238e9936b929ba74e450407767f6caec0f93..a9686d3153c694299fc7da70edc15f7dea3adb23 100644
--- a/android_webview/native/aw_contents.h
+++ b/android_webview/native/aw_contents.h
@@ -37,6 +37,10 @@ namespace content {
 class WebContents;
 }
 
+namespace ui {
+class TouchHandleDrawable;
+}
+
 namespace android_webview {
 
 class AwContentsContainer;
@@ -280,6 +284,7 @@ class AwContents : public FindHelper::Listener,
                          float max_page_scale_factor) override;
   void DidOverscroll(const gfx::Vector2d& overscroll_delta,
                      const gfx::Vector2dF& overscroll_velocity) override;
+  ui::TouchHandleDrawable* CreateDrawable(float dpi_scale) override;
 
   void ClearCache(JNIEnv* env,
                   const base::android::JavaParamRef<jobject>& obj,