android: Introduce a ui::PlatformWindow implementation for android.

components/view_manager/native_viewport/platform_viewport_common.cc

Index: components/view_manager/native_viewport/platform_viewport_common.cc
diff --git a/components/view_manager/native_viewport/platform_viewport_x11.cc b/components/view_manager/native_viewport/platform_viewport_common.cc
similarity index 88%
rename from components/view_manager/native_viewport/platform_viewport_x11.cc
rename to components/view_manager/native_viewport/platform_viewport_common.cc
index c661fb5c09edd68517aabb711d8fca8b8efccf2c..bf20626d3272912a840c7df16f084418e7142670 100644
--- a/components/view_manager/native_viewport/platform_viewport_x11.cc
+++ b/components/view_manager/native_viewport/platform_viewport_common.cc
@@ -17,7 +17,14 @@
 #include "ui/gfx/geometry/rect.h"
 #include "ui/platform_window/platform_window.h"
 #include "ui/platform_window/platform_window_delegate.h"
+
+#if defined(OS_WIN)
+#include "ui/platform_window/win/win_window.h"
+#elif defined(USE_X11)
 #include "ui/platform_window/x11/x11_window.h"
+#elif defined(OS_ANDROID)
+#include "ui/platform_window/android/platform_window_android.h"
+#endif
 
 namespace native_viewport {
 namespace {
@@ -32,13 +39,13 @@ float ConvertUIWheelValueToMojoValue(int offset) {
 }
 }  // namespace
 
-class PlatformViewportX11 : public PlatformViewport,
-                            public ui::PlatformWindowDelegate {
+class PlatformViewportCommon : public PlatformViewport,
+                               public ui::PlatformWindowDelegate {
  public:
-  explicit PlatformViewportX11(Delegate* delegate) : delegate_(delegate) {
+  explicit PlatformViewportCommon(Delegate* delegate) : delegate_(delegate) {
   }
 
-  ~PlatformViewportX11() override {
+  ~PlatformViewportCommon() override {
     // Destroy the platform-window while |this| is still alive.
     platform_window_.reset();
   }
@@ -53,7 +60,13 @@ class PlatformViewportX11 : public PlatformViewport,
     metrics_->device_pixel_ratio = 1.f;
     metrics_->size_in_pixels = mojo::Size::From(bounds.size());
 
+#if defined(OS_WIN)
+    platform_window_.reset(new ui::WinWindow(this, bounds));
+#elif defined(USE_X11)
     platform_window_.reset(new ui::X11Window(this));
+#elif defined(OS_ANDROID)
+    platform_window_.reset(new ui::PlatformWindowAndroid(this));
+#endif
     platform_window_->SetBounds(bounds);
   }
 
@@ -108,6 +121,7 @@ class PlatformViewportX11 : public PlatformViewport,
         break;
     }
 
+#if defined(USE_X11)
     // We want to emulate the WM_CHAR generation behaviour of Windows.
     //
     // On Linux, we've previously inserted characters by having
@@ -138,6 +152,7 @@ class PlatformViewportX11 : public PlatformViewport,
 
       delegate_->OnEvent(mojo::Event::From(char_event));
     }
+#endif
   }
 
   void OnCloseRequest() override { platform_window_->Close(); }
@@ -159,7 +174,7 @@ class PlatformViewportX11 : public PlatformViewport,
   Delegate* delegate_;
   mojo::ViewportMetricsPtr metrics_;
 
-  DISALLOW_COPY_AND_ASSIGN(PlatformViewportX11);
+  DISALLOW_COPY_AND_ASSIGN(PlatformViewportCommon);
 };
 
 // static
@@ -167,7 +182,7 @@ scoped_ptr<PlatformViewport> PlatformViewport::Create(Delegate* delegate,
                                                       bool headless) {
   if (headless)
     return PlatformViewportHeadless::Create(delegate);
-  return make_scoped_ptr(new PlatformViewportX11(delegate));
+  return make_scoped_ptr(new PlatformViewportCommon(delegate));
 }
 
 }  // namespace native_viewport