VideoCaptureParams: add flag for hinting capture using GpuMemoryBuffers & flag for it

media/base/video_capture_types.cc

Index: media/base/video_capture_types.cc
diff --git a/media/base/video_capture_types.cc b/media/base/video_capture_types.cc
index f8463cfa5d6ca3df2d25e764e44f995a68f9e91c..4649e4a697565e0bcf6a604bd3704f6586dfe399 100644
--- a/media/base/video_capture_types.cc
+++ b/media/base/video_capture_types.cc
@@ -108,6 +108,10 @@ std::string VideoCaptureFormat::PixelFormatToString(VideoPixelFormat format) {
 }
 
 VideoCaptureParams::VideoCaptureParams()
-    : resolution_change_policy(RESOLUTION_POLICY_FIXED_RESOLUTION) {}
+    : resolution_change_policy(RESOLUTION_POLICY_FIXED_RESOLUTION)
+#if defined(OS_LINUX)
+      , use_native_gpu_memory_buffers(false)
+#endif
+    {}
 
 }  // namespace media