Mojo: Add WebThemeEngine implementation.

mojo/examples/html_viewer/webthemeengine_impl.cc

Index: mojo/examples/html_viewer/webthemeengine_impl.cc
diff --git a/content/child/webthemeengine_impl_default.cc b/mojo/examples/html_viewer/webthemeengine_impl.cc
similarity index 98%
copy from content/child/webthemeengine_impl_default.cc
copy to mojo/examples/html_viewer/webthemeengine_impl.cc
index 4f78f1c9da21206899fe0e4d18a6d3d087657279..3b329028d630c8ddac79b66296316ee1d337ad99 100644
--- a/content/child/webthemeengine_impl_default.cc
+++ b/mojo/examples/html_viewer/webthemeengine_impl.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "content/child/webthemeengine_impl_default.h"
+#include "mojo/examples/html_viewer/webthemeengine_impl.h"
 
 #include "skia/ext/platform_canvas.h"
 #include "third_party/WebKit/public/platform/WebRect.h"
@@ -14,7 +14,8 @@ using blink::WebColor;
 using blink::WebRect;
 using blink::WebThemeEngine;
 
-namespace content {
+namespace mojo {
+namespace examples {
 
 static ui::NativeTheme::Part NativeThemePart(
     WebThemeEngine::Part part) {
@@ -199,4 +200,5 @@ void WebThemeEngineImpl::paintStateTransition(blink::WebCanvas* canvas,
       gfx::Rect(rect));
 }
 
-}  // namespace content
+}  // namespace examples
+}  // namespace mojo