Support external buffer import in VDA interface and add a V4L2SVDA impl.

content/common/gpu/media/generic_v4l2_device.h

 // 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.
 //
 // This file contains the implementation of GenericV4L2Device used on
 // platforms, which provide generic V4L2 video codec devices.
 
 #ifndef CONTENT_COMMON_GPU_MEDIA_GENERIC_V4L2_DEVICE_H_
 #define CONTENT_COMMON_GPU_MEDIA_GENERIC_V4L2_DEVICE_H_
 
@@ skipping 15 matching lines @@
   bool Poll(bool poll_device, bool* event_pending) override;
   bool SetDevicePollInterrupt() override;
   bool ClearDevicePollInterrupt() override;
   void* Mmap(void* addr,
              unsigned int len,
              int prot,
              int flags,
              unsigned int offset) override;
   void Munmap(void* addr, unsigned int len) override;
   bool Initialize() override;
+
+  std::vector<base::ScopedFD> GetDmabufsForV4L2Buffer(
+      int index,
+      size_t num_planes,
+      enum v4l2_buf_type type) override;
+
   bool CanCreateEGLImageFrom(uint32_t v4l2_pixfmt) override;
-  EGLImageKHR CreateEGLImage(EGLDisplay egl_display,
-                             EGLContext egl_context,
-                             GLuint texture_id,
-                             gfx::Size frame_buffer_size,
-                             unsigned int buffer_index,
-                             uint32_t v4l2_pixfmt,
-                             size_t num_v4l2_planes) override;
+  EGLImageKHR CreateEGLImage(
+      EGLDisplay egl_display,
+      EGLContext egl_context,
+      GLuint texture_id,
+      const gfx::Size& size,
+      unsigned int buffer_index,
+      uint32_t v4l2_pixfmt,
+      const std::vector<base::ScopedFD>& dmabuf_fds) override;
+
   EGLBoolean DestroyEGLImage(EGLDisplay egl_display,
                              EGLImageKHR egl_image) override;
   GLenum GetTextureTarget() override;
   uint32_t PreferredInputFormat() override;
 
  private:
   ~GenericV4L2Device() override;
 
   // The actual device fd.
   base::ScopedFD device_fd_;
 
   // eventfd fd to signal device poll thread when its poll() should be
   // interrupted.
   base::ScopedFD device_poll_interrupt_fd_;
 
   // Use libv4l2 when operating |device_fd_|.
   bool use_libv4l2_;
 
   DISALLOW_COPY_AND_ASSIGN(GenericV4L2Device);
 
   // Lazily initialize static data after sandbox is enabled.  Return false on
   // init failure.
   static bool PostSandboxInitialization();
 };
 }  //  namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_GENERIC_V4L2_DEVICE_H_