Set correct viewport size for an out of process iframe.

content/browser/frame_host/cross_process_frame_connector.cc

 // Copyright 2014 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/frame_host/cross_process_frame_connector.h"
 
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/browser/frame_host/render_widget_host_view_child_frame.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/common/frame_messages.h"
 #include "content/common/gpu/gpu_messages.h"
 
 namespace content {
 
 CrossProcessFrameConnector::CrossProcessFrameConnector(
     RenderFrameHostImpl* frame_proxy_in_parent_renderer)
     : frame_proxy_in_parent_renderer_(frame_proxy_in_parent_renderer),
-      view_(NULL) {
+      view_(NULL),
+      device_scale_factor_(1) {
     frame_proxy_in_parent_renderer->set_cross_process_frame_connector(this);
 }
 
 CrossProcessFrameConnector::~CrossProcessFrameConnector() {
   if (view_)
     view_->set_cross_process_frame_connector(NULL);
 }
 
 bool CrossProcessFrameConnector::OnMessageReceived(const IPC::Message& msg) {
   bool handled = true;
   bool msg_is_ok = true;
 
   IPC_BEGIN_MESSAGE_MAP_EX(CrossProcessFrameConnector, msg, msg_is_ok)
     IPC_MESSAGE_HANDLER(FrameHostMsg_BuffersSwappedACK, OnBuffersSwappedACK)
     IPC_MESSAGE_HANDLER(FrameHostMsg_CompositorFrameSwappedACK,
                         OnCompositorFrameSwappedACK)
     IPC_MESSAGE_HANDLER(FrameHostMsg_ReclaimCompositorResources,
                         OnReclaimCompositorResources)
+    IPC_MESSAGE_HANDLER(FrameHostMsg_InitializeChildFrame,
+                        OnInitializeChildFrame)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP_EX()
 
   return handled;
 }
 
 void CrossProcessFrameConnector::set_view(
     RenderWidgetHostViewChildFrame* view) {
   // Detach ourselves from the previous |view_|.
   if (view_)
@@ skipping 62 matching lines @@
 }
 
 void CrossProcessFrameConnector::OnReclaimCompositorResources(
     const FrameHostMsg_ReclaimCompositorResources_Params& params) {
   RenderWidgetHostImpl::SendReclaimCompositorResources(params.route_id,
                                                        params.output_surface_id,
                                                        params.renderer_host_id,
                                                        params.ack);
 }
 
+void CrossProcessFrameConnector::OnInitializeChildFrame(gfx::Rect frame_rect,
+                                                        float scale_factor) {
+  if (scale_factor != device_scale_factor_) {
+    device_scale_factor_ = scale_factor;
+    if (view_) {
+      RenderWidgetHostImpl* child_widget =
+          RenderWidgetHostImpl::From(view_->GetRenderWidgetHost());
+      child_widget->NotifyScreenInfoChanged();
+    }
+  }
+
+  if (!frame_rect.size().IsEmpty()) {
+    child_frame_rect_ = frame_rect;
+    if (view_)
+      view_->SetSize(frame_rect.size());
+  }
+}
+
 gfx::Rect CrossProcessFrameConnector::ChildFrameRect() {
   return child_frame_rect_;
 }
 
 }  // namespace content