Pass the size to the RenderView on creation.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index e10dba307b8e8c882b17036a1cd59b19131afe3f..27d0c514cd5b75dc6041e8fb5d6248e23de6cdcd 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -789,6 +789,9 @@ void RenderViewImpl::Initialize(RenderViewImplParams* params) {
 
   OnSetRendererPrefs(params->renderer_prefs);
 
+  if (params->initial_size)
+    OnResize(*params->initial_size);
+
   new MHTMLGenerator(this);
 #if defined(OS_MACOSX)
   new TextInputClientObserver(this);
@@ -1136,7 +1139,8 @@ RenderViewImpl* RenderViewImpl::Create(
     bool hidden,
     bool never_visible,
     int32 next_page_id,
-    const blink::WebScreenInfo& screen_info) {
+    const blink::WebScreenInfo& screen_info,
+    const ViewMsg_Resize_Params* initial_size) {
   DCHECK(routing_id != MSG_ROUTING_NONE);
   RenderViewImplParams params(opener_id,
                               window_was_created_with_opener,
@@ -1153,7 +1157,8 @@ RenderViewImpl* RenderViewImpl::Create(
                               hidden,
                               never_visible,
                               next_page_id,
-                              screen_info);
+                              screen_info,
+                              initial_size);
   RenderViewImpl* render_view = NULL;
   if (g_create_render_view_impl)
     render_view = g_create_render_view_impl(&params);
@@ -1687,7 +1692,8 @@ WebView* RenderViewImpl::createView(WebLocalFrame* creator,
       params.disposition == NEW_BACKGROUND_TAB,  // hidden
       never_visible,
       1,  // next_page_id
-      screen_info_);
+      screen_info_,
+      nullptr);
   view->opened_by_user_gesture_ = params.user_gesture;
 
   // Record whether the creator frame is trying to suppress the opener field.