Introduce ViewRoot to forward input/view events to native

content/browser/web_contents/web_contents_view_android.cc

Index: content/browser/web_contents/web_contents_view_android.cc
diff --git a/content/browser/web_contents/web_contents_view_android.cc b/content/browser/web_contents/web_contents_view_android.cc
index 0dc8bf471cc26e6bdadcf88854b21981f2e4fa66..794f5de1f4964bb7aa2c1cd2168cbf7ce845b65d 100644
--- a/content/browser/web_contents/web_contents_view_android.cc
+++ b/content/browser/web_contents/web_contents_view_android.cc
@@ -84,6 +84,7 @@ WebContentsViewAndroid::WebContentsViewAndroid(
       content_view_core_(NULL),
       delegate_(delegate),
       synchronous_compositor_client_(nullptr) {
+  view_.SetViewClient(this);
 }
 
 WebContentsViewAndroid::~WebContentsViewAndroid() {
@@ -237,6 +238,25 @@ void WebContentsViewAndroid::RenderViewSwappedIn(RenderViewHost* host) {
 void WebContentsViewAndroid::SetOverscrollControllerEnabled(bool enabled) {
 }
 
+bool WebContentsViewAndroid::OnPhysicalBackingSizeChanged(int width,
+                                                          int height) {
+  gfx::Size physical_size(width, height);
+  view_.GetLayer()->SetBounds(physical_size);

[boliu, 2016/12/02 23:53:22]

ditto about keeping the layer in sync

[Jinsuk Kim, 2016/12/05 11:07:44]

Defined UpdateLayerBounds() and called it when physical backing size is updated.
This is not complete but help keep the layer size in sync with that of view.

+
+  // |SendScreenRects()| indirectly calls GetViewSize() that asks Java layer.
+  web_contents_->SendScreenRects();
+
+  RenderWidgetHostView* rwhv = !web_contents_->ShowingInterstitialPage() ?
+      web_contents_->GetRenderWidgetHostView() :
+      web_contents_->GetInterstitialPage()
+                    ->GetMainFrame()
+                    ->GetRenderViewHost()
+                    ->GetWidget()
+                    ->GetView();
+  (static_cast<RenderWidgetHostViewAndroid*>(rwhv))->WasResized();
+  return true;
+}
+
 void WebContentsViewAndroid::ShowContextMenu(
     RenderFrameHost* render_frame_host, const ContextMenuParams& params) {
   if (delegate_)