Make sure Legacy HWND is created and has proper bounds on bounds change.

content/browser/web_contents/web_contents_view_aura.cc

Index: content/browser/web_contents/web_contents_view_aura.cc
diff --git a/content/browser/web_contents/web_contents_view_aura.cc b/content/browser/web_contents/web_contents_view_aura.cc
index a8357355ca5a8c71ff16d123be1add1f3619e773..4aa74eb1794c98e0e0f03e9967c71d4dca866d88 100644
--- a/content/browser/web_contents/web_contents_view_aura.cc
+++ b/content/browser/web_contents/web_contents_view_aura.cc
@@ -1478,6 +1478,17 @@ void WebContentsViewAura::OnBoundsChanged(const gfx::Rect& old_bounds,
       window_->children()[i]->SetBounds(bounds);
     }
   }
+
+#if defined(OS_WIN)
+  if (!legacy_hwnd_ && window_ && window_->GetHost()) {
+    HWND parent_hwnd = window_->GetHost()->GetAcceleratedWidget();
+    CHECK(parent_hwnd);

[ananta, 2014/12/05 19:58:02]

Please verify if this does not crash in Windows 8 mode.

[dmazzoni, 2014/12/05 20:56:06]

Verified manually. This same CHECK appears above too, and I haven't seen any bug
reports from it.

+    legacy_hwnd_.reset(LegacyRenderWidgetHostHWND::Create(parent_hwnd, this));
+  }
+
+  if (legacy_hwnd_)
+    legacy_hwnd_->SetBounds(window_->GetBoundsInRootWindow());
+#endif
 }
 
 gfx::NativeCursor WebContentsViewAura::GetCursor(const gfx::Point& point) {