diff -r 000000000000 -r 6474c204b198 widget/windows/winrt/MetroUtils.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/windows/winrt/MetroUtils.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,96 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#pragma once
+
+#include "nsDebug.h"
+#include "nsThreadUtils.h"
+#include "nsString.h"
+#include "nsPoint.h"
+#include "WinUtils.h"
+
+#include "mozwrlbase.h"
+
+#include <stdio.h>
+#include <windows.foundation.h>
+#include <windows.ui.viewmanagement.h>
+
+// HRESULT checkers, these warn on failure in debug builds
+#ifdef DEBUG
+#define DebugLogHR(hr) LogHRESULT(hr)
+#else
+#define DebugLogHR(hr)
+#endif
+#define AssertHRESULT(hr)           \
+  if (FAILED(hr)) {                 \
+    DebugLogHR(hr);                 \
+    return;                         \
+  }
+#define AssertRetHRESULT(hr, res)   \
+  if (FAILED(hr)) {                 \
+    DebugLogHR(hr);                 \
+    return res;                     \
+  }
+
+// MS Point helpers
+#define POINT_CEIL_X(position) (uint32_t)ceil(position.X)
+#define POINT_CEIL_Y(position) (uint32_t)ceil(position.Y)
+
+class nsIBrowserDOMWindow;
+class nsIDOMWindow;
+struct nsIntRect;
+
+namespace mozilla {
+namespace widget {
+namespace winrt {
+
+template<unsigned int size, typename T>
+HRESULT ActivateGenericInstance(wchar_t const (&RuntimeClassName)[size], Microsoft::WRL::ComPtr<T>& aOutObject) {
+  Microsoft::WRL::ComPtr<IActivationFactory> factory;
+  HRESULT hr = ABI::Windows::Foundation::GetActivationFactory(Microsoft::WRL::Wrappers::HStringReference(RuntimeClassName).Get(),
+                                                              factory.GetAddressOf());
+  if (FAILED(hr))
+    return hr;
+  Microsoft::WRL::ComPtr<IInspectable> inspect;
+  hr = factory->ActivateInstance(inspect.GetAddressOf());
+  if (FAILED(hr))
+    return hr;
+  return inspect.As(&aOutObject);
+}
+
+} } }
+
+class MetroUtils
+{
+  typedef ABI::Windows::Foundation::IUriRuntimeClass IUriRuntimeClass;
+  typedef Microsoft::WRL::Wrappers::HString HString;
+  typedef ABI::Windows::UI::ViewManagement::ApplicationViewState ApplicationViewState;
+  typedef ABI::Windows::Foundation::Point Point;
+  typedef ABI::Windows::Foundation::Rect Rect;
+
+public:
+  // Functions to convert between logical pixels as used by most Windows APIs
+  // and physical (device) pixels.
+  static double LogToPhysFactor();
+  static double PhysToLogFactor();
+  static nsIntPoint LogToPhys(const Point& aPt);
+  static nsIntRect LogToPhys(const Rect& aRect);
+  static Point PhysToLog(const nsIntPoint& aPt);
+
+  // Resolution scale factor
+  static double ScaleFactor();
+
+  static nsresult FireObserver(const char* aMessage, const char16_t* aData = nullptr);
+
+  static HRESULT CreateUri(HSTRING aUriStr, Microsoft::WRL::ComPtr<IUriRuntimeClass>& aUriOut);
+  static HRESULT CreateUri(HString& aHString, Microsoft::WRL::ComPtr<IUriRuntimeClass>& aUriOut);
+  static HRESULT GetViewState(ApplicationViewState& aState);
+  static HRESULT TryUnsnap(bool* aResult = nullptr);
+  static HRESULT ShowSettingsFlyout();
+
+private:
+  static nsresult GetBrowserDOMWindow(nsCOMPtr<nsIBrowserDOMWindow> &aBWin);
+  static nsresult GetMostRecentWindow(const char16_t* aType, nsIDOMWindow** aWindow);
+};