[Android WebView] Update SW rendering to use SkPicture and fix scrolling cases.

android_webview/renderer/aw_render_view_ext.cc

Index: android_webview/renderer/aw_render_view_ext.cc
diff --git a/android_webview/renderer/aw_render_view_ext.cc b/android_webview/renderer/aw_render_view_ext.cc
index 86f56accfc407942bf7418a0a7d34666fbadf803..08475a8274ab1ac27fe828a44beeddeb82c965e2 100644
--- a/android_webview/renderer/aw_render_view_ext.cc
+++ b/android_webview/renderer/aw_render_view_ext.cc
@@ -200,8 +200,7 @@ void AwRenderViewExt::OnEnableCapturePictureCallback(bool enable) {
   //    content::RenderView::CapturePictureCallback());
 }
 
-void AwRenderViewExt::OnPictureUpdate(
-    scoped_refptr<cc::PicturePileImpl> picture) {
+void AwRenderViewExt::OnPictureUpdate(skia::RefPtr<SkPicture> picture) {
   RendererPictureMap::GetInstance()->SetRendererPicture(routing_id(), picture);
   Send(new AwViewHostMsg_PictureUpdated(routing_id()));
 }