Mojo: Add embedder::PlatformSupport and a simple implementation (and a bit of plumbing).

R=darin@chromium.org

Review URL: https://codereview.chromium.org/475223002

Cr-Commit-Position: refs/heads/master@{#289878}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289878 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 102 insertions, 0 deletions

diff --git a/mojo/embedder/platform_support.h b/mojo/embedder/platform_support.h
new file mode 100644
index 0000000..8b52fdc
--- /dev/null
+++ b/mojo/embedder/platform_support.h
@@ -0,0 +1,40 @@
+// 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.
+
+#ifndef MOJO_EMBEDDER_PLATFORM_SUPPORT_H_
+#define MOJO_EMBEDDER_PLATFORM_SUPPORT_H_
+
+#include <stddef.h>
+
+#include "base/macros.h"
+#include "mojo/embedder/scoped_platform_handle.h"
+#include "mojo/system/system_impl_export.h"
+
+namespace mojo {
+namespace embedder {
+
+class PlatformSharedBuffer;
+
+// This class is provided by the embedder to implement (typically
+// platform-dependent) things needed by the Mojo system implementation.
+class MOJO_SYSTEM_IMPL_EXPORT PlatformSupport {
+ public:
+  virtual ~PlatformSupport() {}
+
+  virtual PlatformSharedBuffer* CreateSharedBuffer(size_t num_bytes) = 0;
+  virtual PlatformSharedBuffer* CreateSharedBufferFromHandle(
+      size_t num_bytes,
+      ScopedPlatformHandle platform_handle) = 0;
+
+ protected:
+  PlatformSupport() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PlatformSupport);
+};
+
+}  // namespace embedder
+}  // namespace mojo
+
+#endif  // MOJO_EMBEDDER_PLATFORM_SUPPORT_H_
diff --git a/mojo/embedder/simple_platform_support.cc b/mojo/embedder/simple_platform_support.cc
new file mode 100644
index 0000000..1c7f82b
--- /dev/null
+++ b/mojo/embedder/simple_platform_support.cc
@@ -0,0 +1,25 @@
+// 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 "mojo/embedder/simple_platform_support.h"
+
+#include "mojo/embedder/simple_platform_shared_buffer.h"
+
+namespace mojo {
+namespace embedder {
+
+PlatformSharedBuffer* SimplePlatformSupport::CreateSharedBuffer(
+    size_t num_bytes) {
+  return SimplePlatformSharedBuffer::Create(num_bytes);
+}
+
+PlatformSharedBuffer* SimplePlatformSupport::CreateSharedBufferFromHandle(
+    size_t num_bytes,
+    ScopedPlatformHandle platform_handle) {
+  return SimplePlatformSharedBuffer::CreateFromPlatformHandle(
+      num_bytes, platform_handle.Pass());
+}
+
+}  // namespace embedder
+}  // namespace mojo
diff --git a/mojo/embedder/simple_platform_support.h b/mojo/embedder/simple_platform_support.h
new file mode 100644
index 0000000..899c027
--- /dev/null
+++ b/mojo/embedder/simple_platform_support.h
@@ -0,0 +1,37 @@
+// 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.
+
+#ifndef MOJO_EMBEDDER_SIMPLE_PLATFORM_SUPPORT_H_
+#define MOJO_EMBEDDER_SIMPLE_PLATFORM_SUPPORT_H_
+
+#include "base/macros.h"
+#include "mojo/embedder/platform_support.h"
+#include "mojo/system/system_impl_export.h"
+
+namespace mojo {
+namespace embedder {
+
+// A simple implementation of |PlatformSupport|, when sandboxing and
+// multiprocess support are not issues (e.g., in most tests). Note: This class
+// has no state, and different instances of |SimplePlatformSupport| are mutually
+// compatible (i.e., you don't need to use a single instance of it everywhere --
+// you may simply create one whenever/wherever you need it).
+class MOJO_SYSTEM_IMPL_EXPORT SimplePlatformSupport : public PlatformSupport {
+ public:
+  SimplePlatformSupport() {}
+  virtual ~SimplePlatformSupport() {}
+
+  virtual PlatformSharedBuffer* CreateSharedBuffer(size_t num_bytes) OVERRIDE;
+  virtual PlatformSharedBuffer* CreateSharedBufferFromHandle(
+      size_t num_bytes,
+      ScopedPlatformHandle platform_handle) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SimplePlatformSupport);
+};
+
+}  // namespace embedder
+}  // namespace mojo
+
+#endif  // MOJO_EMBEDDER_SIMPLE_PLATFORM_SUPPORT_H_