Introduce ViewRoot to forward input/view events to native

content/browser/web_contents/web_contents_view_android.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/web_contents/web_contents_view_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/logging.h"
 #include "cc/layers/layer.h"
@@ skipping 65 matching lines @@
   *render_view_host_delegate_view = rv;
   return rv;
 }
 
 WebContentsViewAndroid::WebContentsViewAndroid(
     WebContentsImpl* web_contents,
     WebContentsViewDelegate* delegate)
     : web_contents_(web_contents),
       content_view_core_(NULL),
       delegate_(delegate),
-      synchronous_compositor_client_(nullptr) {
-}
+      view_(this),
+      synchronous_compositor_client_(nullptr) {}
 
 WebContentsViewAndroid::~WebContentsViewAndroid() {
   if (view_.GetLayer())
     view_.GetLayer()->RemoveFromParent();
 }
 
 void WebContentsViewAndroid::SetContentViewCore(
     ContentViewCoreImpl* content_view_core) {
   content_view_core_ = content_view_core;
   RenderWidgetHostViewAndroid* rwhv = static_cast<RenderWidgetHostViewAndroid*>(
@@ skipping 132 matching lines @@
 
 void WebContentsViewAndroid::RenderViewCreated(RenderViewHost* host) {
 }
 
 void WebContentsViewAndroid::RenderViewSwappedIn(RenderViewHost* host) {
 }
 
 void WebContentsViewAndroid::SetOverscrollControllerEnabled(bool enabled) {
 }
 
+void WebContentsViewAndroid::OnPhysicalBackingSizeChanged(int width,
+                                                          int height) {
+  // |SendScreenRects()| indirectly calls GetViewSize() that asks Java layer.
+  web_contents_->SendScreenRects();

[boliu, 2016/12/06 23:15:46]

so this code is duplicated from
ContentViewCoreImpl::SendScreenRectsAndResizeWidget, right?

I think the size change should not need to be forwarded to RWHVA from here.
Instead, RWHVA can be ViewClient as well, and listen to size updates.

[Jinsuk Kim, 2016/12/07 12:36:28]

Done.

+
+  RenderWidgetHostView* rwhv = !web_contents_->ShowingInterstitialPage() ?
+      web_contents_->GetRenderWidgetHostView() :
+      web_contents_->GetInterstitialPage()
+                    ->GetMainFrame()
+                    ->GetRenderViewHost()
+                    ->GetWidget()
+                    ->GetView();
+  (static_cast<RenderWidgetHostViewAndroid*>(rwhv))->WasResized();
+}
+
 void WebContentsViewAndroid::ShowContextMenu(
     RenderFrameHost* render_frame_host, const ContextMenuParams& params) {
   if (delegate_)
     delegate_->ShowContextMenu(render_frame_host, params);
 }
 
 void WebContentsViewAndroid::ShowPopupMenu(
     RenderFrameHost* render_frame_host,
     const gfx::Rect& bounds,
     int item_height,
@@ skipping 114 matching lines @@
 // This is called when we the renderer asks us to take focus back (i.e., it has
 // iterated past the last focusable element on the page).
 void WebContentsViewAndroid::TakeFocus(bool reverse) {
   if (web_contents_->GetDelegate() &&
       web_contents_->GetDelegate()->TakeFocus(web_contents_, reverse))
     return;
   web_contents_->GetRenderWidgetHostView()->Focus();
 }
 
 } // namespace content