MJPEG acceleration for video capture, browser part

content/browser/renderer_host/media/video_capture_buffer_pool.cc

Index: content/browser/renderer_host/media/video_capture_buffer_pool.cc
diff --git a/content/browser/renderer_host/media/video_capture_buffer_pool.cc b/content/browser/renderer_host/media/video_capture_buffer_pool.cc
index f636f3ac819e0b04c9eb4dc8f614983c6762aee5..50a1e122a294acc60290666fe28bf69ec723591a 100644
--- a/content/browser/renderer_host/media/video_capture_buffer_pool.cc
+++ b/content/browser/renderer_host/media/video_capture_buffer_pool.cc
@@ -61,7 +61,8 @@ VideoFrame::StorageType VideoPixelFormatToVideoFrameStorageType(
 // A simple holder of a memory-backed buffer and accesors to it.
 class SimpleBufferHandle final : public VideoCaptureBufferPool::BufferHandle {
  public:
-  SimpleBufferHandle(void* data, size_t size) : data_(data), size_(size) {}
+  SimpleBufferHandle(void* data, size_t size, base::SharedMemoryHandle handle)
+      : data_(data), size_(size), handle_(handle) {}
   ~SimpleBufferHandle() override {}
 
   size_t size() const override { return size_; }
@@ -70,10 +71,18 @@ class SimpleBufferHandle final : public VideoCaptureBufferPool::BufferHandle {
     return gfx::SHARED_MEMORY_BUFFER;
   }
   ClientBuffer AsClientBuffer() override { return nullptr; }
+  base::PlatformFile AsPlatformHandle() override {
+#if defined(OS_POSIX)
+    return handle_.fd;
+#else
+    return handle_;
+#endif
+  }
 
  private:
   void* const data_;
   const size_t size_;
+  const base::SharedMemoryHandle handle_;
 };
 
 // A holder of a GpuMemoryBuffer-backed buffer, Map()ed on ctor and Unmap()ed on
@@ -99,6 +108,13 @@ class GpuMemoryBufferBufferHandle
     return gmb_->GetHandle().type;
   }
   ClientBuffer AsClientBuffer() override { return gmb_->AsClientBuffer(); }
+  base::PlatformFile AsPlatformHandle() override {
+#if defined(OS_POSIX)
+    return gmb_->GetHandle().handle.fd;
+#else
+    return gmb_->GetHandle().handle;
+#endif
+  }
 
  private:
   gfx::GpuMemoryBuffer* const gmb_;
@@ -117,8 +133,8 @@ class VideoCaptureBufferPool::SharedMemTracker final : public Tracker {
   size_t mapped_size() const override { return shared_memory_.mapped_size(); }
 
   scoped_ptr<BufferHandle> GetBufferHandle() override {
-    return make_scoped_ptr(
-        new SimpleBufferHandle(shared_memory_.memory(), mapped_size()));
+    return make_scoped_ptr(new SimpleBufferHandle(
+        shared_memory_.memory(), mapped_size(), shared_memory_.handle()));
   }
 
   bool ShareToProcess(base::ProcessHandle process_handle,