ImageCapture: Implement TakePhoto() for Linux/CrOs

media/capture/BUILD.gn

Index: media/capture/BUILD.gn
diff --git a/media/capture/BUILD.gn b/media/capture/BUILD.gn
index 989a550a62d751a0579c3e972ccea4fc8a4ec1e2..acc22fb43f14c22593321035722b61ac4790437d 100644
--- a/media/capture/BUILD.gn
+++ b/media/capture/BUILD.gn
@@ -31,6 +31,7 @@ component("capture") {
     "video/file_video_capture_device_factory.cc",
     "video/file_video_capture_device_factory.h",
     "video/linux/v4l2_capture_delegate.cc",
+    "video/linux/v4l2_capture_delegate.h",
     "video/linux/video_capture_device_chromeos.cc",
     "video/linux/video_capture_device_chromeos.h",
     "video/linux/video_capture_device_factory_linux.cc",
@@ -131,6 +132,10 @@ component("capture") {
     # TODO(jschuh): https://crbug.com/167187 fix size_t to int truncations.
     configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
   }
+
+  if (is_linux || is_chromeos) {
+    deps += [ "//third_party/libyuv" ]
+  }
 }
 
 test("capture_unittests") {