Stretching NativeViewHost, and misc tab capture fixes.

ui/views/controls/native/native_view_host_aura.h

Index: ui/views/controls/native/native_view_host_aura.h
diff --git a/ui/views/controls/native/native_view_host_aura.h b/ui/views/controls/native/native_view_host_aura.h
index 45e859082eb7ddd2b551d384c254d48e6087df35..8dc2bbab8aeea3897fbafd3ea603c6a87f843575 100644
--- a/ui/views/controls/native/native_view_host_aura.h
+++ b/ui/views/controls/native/native_view_host_aura.h
@@ -9,6 +9,7 @@
 #include "base/macros.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_observer.h"
+#include "ui/gfx/transform.h"
 #include "ui/views/controls/native/native_view_host_wrapper.h"
 #include "ui/views/views_export.h"
 
@@ -31,7 +32,8 @@ class VIEWS_EXPORT NativeViewHostAura : public NativeViewHostWrapper,
   void InstallClip(int x, int y, int w, int h) override;
   bool HasInstalledClip() override;
   void UninstallClip() override;
-  void ShowWidget(int x, int y, int w, int h) override;
+  void ShowWidget(int x, int y, int w, int h, int render_w, int render_h)
+      override;
   void HideWidget() override;
   void SetFocus() override;
   gfx::NativeViewAccessible GetNativeViewAccessible() override;
@@ -65,6 +67,13 @@ class VIEWS_EXPORT NativeViewHostAura : public NativeViewHostWrapper,
   aura::Window clipping_window_;
   std::unique_ptr<gfx::Rect> clip_rect_;
 
+  // Set when AttachNativeView() is called. This is the original transform of
+  // the NativeView's layer. The NativeView's layer may be modified to scale
+  // when ShowWidget() is called with a rendering size not equal to the region's
+  // size. When NativeViewDetaching() is called, the NativeView's
+  // transform is restored to this.
+  gfx::Transform original_transform_;
+
   DISALLOW_COPY_AND_ASSIGN(NativeViewHostAura);
 };