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 338d07eb410e963b6fc9993c5aa4a1e1446f10f3..7757ea079add829111bdff4db97874d191d560bf 100644
--- a/content/browser/web_contents/web_contents_view_android.cc
+++ b/content/browser/web_contents/web_contents_view_android.cc
@@ -6,6 +6,7 @@
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
+#include "base/bind.h"
 #include "base/logging.h"
 #include "cc/layers/layer.h"
 #include "content/browser/android/content_view_core_impl.h"
@@ -22,6 +23,8 @@
 #include "ui/gfx/android/java_bitmap.h"
 #include "ui/gfx/image/image_skia.h"
 
+using base::Bind;
+using base::Unretained;
 using base::android::AttachCurrentThread;
 using base::android::ConvertUTF16ToJavaString;
 using base::android::JavaRef;
@@ -84,6 +87,7 @@ WebContentsViewAndroid::WebContentsViewAndroid(
 WebContentsViewAndroid::~WebContentsViewAndroid() {
   if (view_.GetLayer())
     view_.GetLayer()->RemoveFromParent();
+  view_.reset_physical_backing_size_changed_handler();
 }
 
 void WebContentsViewAndroid::SetContentViewCore(
@@ -104,6 +108,23 @@ void WebContentsViewAndroid::SetContentViewCore(
     if (rwhv)
       rwhv->SetContentViewCore(content_view_core_);
   }
+
+  view_.reset_physical_backing_size_changed_handler(
+      Bind(&WebContentsViewAndroid::OnPhysicalBackingSizeChanged,
+           Unretained(this)));
+}
+
+void WebContentsViewAndroid::OnPhysicalBackingSizeChanged(int width,
+                                                          int height) {
+  gfx::Size physical_size(width, height);
+  view_.GetLayer()->SetBounds(physical_size);
+
+  RenderWidgetHostViewAndroid* rwhv = static_cast<RenderWidgetHostViewAndroid*>(
+      web_contents_->GetRenderWidgetHostView());
+  if (rwhv) {
+    web_contents_->SendScreenRects();
+    rwhv->WasResized();
+  }
 }
 
 gfx::NativeView WebContentsViewAndroid::GetNativeView() const {