Enable display rotation, magnifier in unified desktop mode

ash/host/transformer_helper.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/host/transformer_helper.h"
 
 #include "ash/host/ash_window_tree_host.h"
 #include "ash/host/root_window_transformer.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
@@ skipping 40 matching lines @@
   const aura::Window* root_window_;
   const gfx::Transform transform_;
 
   DISALLOW_COPY_AND_ASSIGN(SimpleRootWindowTransformer);
 };
 
 }  // namespace
 
 TransformerHelper::TransformerHelper(AshWindowTreeHost* ash_host)
     : ash_host_(ash_host) {
-  SetTransform(gfx::Transform());
+#if defined(OS_WIN)
+  Init();

[oshima, 2015/05/01 20:58:16]

here

[Jun Mukai, 2015/05/01 22:06:07]

I'm not sure what's this is for.
_ozone, _x11, and _unified invoke Init() on its constructor, and the helper is
constructed inside of the class.  The last implementation is _win, and for
windows it invokes Init() here.
Why you create Init, and why it's not always invoked here?

[oshima, 2015/05/01 22:44:57]

As I mentioned, I'm still investigating but windows seems to have slightly
different call path.

+#endif
 }
 
 TransformerHelper::~TransformerHelper() {}
 
+void TransformerHelper::Init() {
+  SetTransform(gfx::Transform());
+}
+
 gfx::Insets TransformerHelper::GetHostInsets() const {
   return transformer_->GetHostInsets();
 }
 
 void TransformerHelper::SetTransform(const gfx::Transform& transform) {
   scoped_ptr<RootWindowTransformer> transformer(new SimpleRootWindowTransformer(
       ash_host_->AsWindowTreeHost()->window(), transform));
   SetRootWindowTransformer(transformer.Pass());
 }
 
@@ skipping 25 matching lines @@
   transform.Scale(1.0f / scale, 1.0f / scale);
   return transformer_->GetInverseTransform() * transform;
 }
 
 void TransformerHelper::UpdateWindowSize(const gfx::Size& host_size) {
   ash_host_->AsWindowTreeHost()->window()->SetBounds(
       transformer_->GetRootWindowBounds(host_size));
 }
 
 }  // namespace ash