Send resize event when the screen info changes.

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index fe0203ff98f81e007b0d7e22aaa10b0bd7048e96..bb39189b6972df5a73170e9c4d65c5da03fc208c 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -170,7 +170,7 @@ RenderWidgetHostImpl::RenderWidgetHostImpl(RenderWidgetHostDelegate* delegate,
       is_hidden_(hidden),
       repaint_ack_pending_(false),
       resize_ack_pending_(false),
-      screen_info_out_of_date_(false),
+      screen_info_out_of_date_(true),
       auto_resize_enabled_(false),
       waiting_for_screen_rects_ack_(false),
       needs_repainting_on_restore_(false),
@@ -580,9 +580,11 @@ bool RenderWidgetHostImpl::GetResizeParams(
     ViewMsg_Resize_Params* resize_params) {
   *resize_params = ViewMsg_Resize_Params();
 
-  if (!screen_info_) {
+  const bool screen_info_was_out_of_date = screen_info_out_of_date_;
+  if (screen_info_out_of_date_) {
     screen_info_.reset(new blink::WebScreenInfo);
     GetWebScreenInfo(screen_info_.get());
+    screen_info_out_of_date_ = false;
   }

[no sievers, 2015/04/10 18:40:31]

Should we just move this out to WasResized()?
And then pass in |screen_info_was_out_of_date|.

Then we can make this getter methods const without hidden side-effects.

[mlamouri (slow - plz ping), 2015/04/13 11:39:08]

Done.

   resize_params->screen_info = *screen_info_;
   resize_params->resizer_rect = GetRootWindowResizerRect();
@@ -603,7 +605,7 @@ bool RenderWidgetHostImpl::GetResizeParams(
       (old_resize_params_->physical_backing_size.IsEmpty() &&
        !resize_params->physical_backing_size.IsEmpty());
   bool dirty =
-      size_changed || screen_info_out_of_date_ ||
+      size_changed || screen_info_was_out_of_date ||
       old_resize_params_->physical_backing_size !=
           resize_params->physical_backing_size ||
       old_resize_params_->is_fullscreen != resize_params->is_fullscreen ||
@@ -1135,7 +1137,6 @@ void RenderWidgetHostImpl::GetWebScreenInfo(blink::WebScreenInfo* result) {
   else
     RenderWidgetHostViewBase::GetDefaultScreenInfo(result);
   latency_tracker_.set_device_scale_factor(result->deviceScaleFactor);
-  screen_info_out_of_date_ = false;
 }
 
 const NativeWebKeyboardEvent*