GPU plugin forwards repaint events to Pepper plugin.

WM_PAINT results in a call to Pepper repaint callback.
Implemented WM_ERASEBKGND to prevent flickering on repaint.
Implemented PGL_NO_CONTEXT (copied from EGL spec). This is already reviewed by alokp but unfortunately got entangled with this CL.

TEST=none
BUG=none

Review URL: http://codereview.chromium.org/571018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@39530 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 50 insertions, 0 deletions

diff --git a/base/base.gypi b/base/base.gypi
index 66094b9d..0c9de8c 100644
--- a/base/base.gypi
+++ b/base/base.gypi
@@ -178,6 +178,7 @@
           'scoped_nsautorelease_pool.mm',
           'scoped_nsdisable_screen_updates.h',
           'scoped_nsobject.h',
+          'scoped_open_process.h',
           'scoped_ptr.h',
           'scoped_temp_dir.cc',
           'scoped_temp_dir.h',
diff --git a/base/scoped_open_process.h b/base/scoped_open_process.h
new file mode 100644
index 0000000..9badc76
--- /dev/null
+++ b/base/scoped_open_process.h
@@ -0,0 +1,49 @@
+// Copyright (c) 2010 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 BASE_SCOPED_OPEN_PROCESS_H_
+#define BASE_SCOPED_OPEN_PROCESS_H_
+
+#include "base/process.h"
+#include "base/process_util.h"
+
+namespace base {
+
+// A class that opens a process from its process id and closes it when the
+// instance goes out of scope.
+class ScopedOpenProcess {
+ public:
+  ScopedOpenProcess() : handle_(kNullProcessHandle) {
+  }
+
+  // Automatically close the process.
+  ~ScopedOpenProcess() {
+    Close();
+  }
+
+  // Open a new process by pid. Closes any previously opened process (even if
+  // opening the new one fails).
+  bool Open(ProcessId pid) {
+    Close();
+    return OpenProcessHandle(pid, &handle_);
+  }
+
+  // Close the previously opened process.
+  void Close() {
+    if (handle_ == kNullProcessHandle)
+      return;
+
+    CloseProcessHandle(handle_);
+    handle_ = kNullProcessHandle;
+  }
+
+  ProcessHandle handle() const { return handle_; }
+
+ private:
+  ProcessHandle handle_;
+  DISALLOW_COPY_AND_ASSIGN(ScopedOpenProcess);
+};
+}  // namespace base
+
+#endif  // BASE_SCOPED_OPEN_PROCESS_H_