Add a basic NativeViewportMac for Mojo

mojo/services/native_viewport/native_viewport_mac.mm

+// Copyright 2013 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 "mojo/services/native_viewport/native_viewport.h"
+
+#import <AppKit/NSApplication.h>
+#import <AppKit/NSView.h>
+#import <AppKit/NSWindow.h>
+
+#include "base/bind.h"
+#include "base/mac/scoped_nsobject.h"
+#include "gpu/command_buffer/client/gl_in_process_context.h"
+#include "gpu/command_buffer/client/gles2_implementation.h"
+#include "ui/gfx/rect.h"
+
+namespace mojo {
+namespace services {
+
+class NativeViewportMac : public NativeViewport {
+ public:
+  NativeViewportMac(NativeViewportDelegate* delegate)
+      : delegate_(delegate),
+        window_(nil),
+        rect_(10, 10, 500, 500) {
+    [NSApplication sharedApplication];
+
+    window_ = [[NSWindow alloc]
+                  initWithContentRect:NSRectFromCGRect(rect_.ToCGRect())
+                            styleMask:NSBorderlessWindowMask

[Ben Goodger (Google), 2013/11/05 06:57:01]

for developer convenience, we might like to make this a framed window for the
time being, at least on desktop platforms. 

[abarth-chromium, 2013/11/05 07:03:25]

Will do.

+                              backing:NSBackingStoreBuffered
+                                defer:NO];
+    [window_ orderFront:nil];
+
+    gpu::GLInProcessContextAttribs attribs;
+    gl_context_.reset(gpu::GLInProcessContext::CreateContext(
+        false, [window_ contentView], rect_.size(), false,
+        attribs, gfx::PreferDiscreteGpu));
+    gl_context_->SetContextLostCallback(base::Bind(
+        &NativeViewportMac::OnGLContextLost, base::Unretained(this)));
+
+    delegate_->OnGLContextAvailable(gl_context_->GetImplementation());
+  }
+
+  virtual ~NativeViewportMac() {
+    [window_ orderOut:nil];
+    [window_ close];
+  }
+
+ private:
+  // Overridden from NativeViewport:
+  virtual void Close() OVERRIDE {
+    // TODO(beng): perform this in response to XWindow destruction.

[Ben Goodger (Google), 2013/11/05 06:57:01]

in response to NSWindow destruction

[abarth-chromium, 2013/11/05 07:03:25]

Yep.

+    delegate_->OnDestroyed();
+  }
+
+  void OnGLContextLost() {
+    gl_context_.reset();
+    delegate_->OnGLContextLost();
+  }
+
+  NativeViewportDelegate* delegate_;
+  NSWindow* window_;
+  gfx::Rect rect_;
+  scoped_ptr<gpu::GLInProcessContext> gl_context_;
+
+  DISALLOW_COPY_AND_ASSIGN(NativeViewportMac);
+};
+
+// static
+scoped_ptr<NativeViewport> NativeViewport::Create(
+    shell::Context* context,
+    NativeViewportDelegate* delegate) {
+  return scoped_ptr<NativeViewport>(new NativeViewportMac(delegate)).Pass();
+}
+
+}  // namespace services
+}  // namespace mojo