Abstract PPAPI's ImageData behind webrtc::DesktopFrame interface

remoting/client/plugin/pepper_image_buffer.cc

+#include "remoting/client/plugin/pepper_image_buffer.h"
+
+using pp::ImageData;
+
+namespace remoting {
+
+PepperImageBuffer::PepperImageBuffer(const pp::InstanceHandle& instance,
+                                     int width,
+                                     int height)
+  : size_(width, height),
+    data_(instance, PP_IMAGEDATAFORMAT_BGRA_PREMUL, size_, false) {}
+
+bool PepperImageBuffer::is_null() {
+  return data_.is_null();
+}
+
+uint8* PepperImageBuffer::data() {
+  return reinterpret_cast<uint8*>(data_.data());
+}
+
+int PepperImageBuffer::width() {
+  return data_.size().width();
+}
+
+int PepperImageBuffer::height() {
+  return data_.size().height();
+}
+
+int32 PepperImageBuffer::stride() {
+  return data_.stride();
+}
+
+const ImageData& PepperImageBuffer::data_object() {
+  return data_;
+}
+
+}  // namespace remoting