android_webview: Let AwContents manage TouchHandleDrawable

android_webview/browser/browser_view_renderer_client.h

Index: android_webview/browser/browser_view_renderer_client.h
diff --git a/android_webview/browser/browser_view_renderer_client.h b/android_webview/browser/browser_view_renderer_client.h
index ba154b6d31a333d44e05097fb9f3ae200d4922ce..2bc1e7f04cbd374280d27233dff9511a8e55a640 100644
--- a/android_webview/browser/browser_view_renderer_client.h
+++ b/android_webview/browser/browser_view_renderer_client.h
@@ -10,6 +10,10 @@
 #include "ui/gfx/geometry/size_f.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 
+namespace ui {
+class TouchHandleDrawable;
+}
+
 namespace android_webview {
 struct ParentCompositorDrawConstraints;
 
@@ -46,6 +50,12 @@ class BrowserViewRendererClient {
   virtual void DidOverscroll(const gfx::Vector2d& overscroll_delta,
                              const gfx::Vector2dF& overscroll_velocity) = 0;
 
+  // Create a text selection handle on demand.
+  virtual ui::TouchHandleDrawable* CreateDrawable() = 0;
+
+  // Remove all the text selection handles at the end of their lifecycle.
+  virtual void DestroyAllDrawables() = 0;
+
  protected:
   virtual ~BrowserViewRendererClient() {}
 };