ImageCapture: Implement TakePhoto() for Linux/CrOs

media/capture/BUILD.gn

 # Copyright 2016 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.
 
 import("//build/config/features.gni")
 import("//media/media_options.gni")
 import("//testing/test.gni")
 
 component("capture") {
   defines = [ "CAPTURE_IMPLEMENTATION" ]
@@ skipping 13 matching lines @@
     "content/video_capture_oracle.h",
     "video/fake_video_capture_device.cc",
     "video/fake_video_capture_device.h",
     "video/fake_video_capture_device_factory.cc",
     "video/fake_video_capture_device_factory.h",
     "video/file_video_capture_device.cc",
     "video/file_video_capture_device.h",
     "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",
     "video/linux/video_capture_device_factory_linux.h",
     "video/linux/video_capture_device_linux.cc",
     "video/linux/video_capture_device_linux.h",
     "video/mac/video_capture_device_avfoundation_mac.h",
     "video/mac/video_capture_device_avfoundation_mac.mm",
     "video/mac/video_capture_device_decklink_mac.h",
     "video/mac/video_capture_device_decklink_mac.mm",
@@ skipping 27 matching lines @@
     "video/win/video_capture_device_win.h",
   ]
 
   public_deps = []
   deps = [
     "//base",
     "//base:i18n",
     "//media",
     "//media/mojo/interfaces:image_capture",
     "//skia",
+    "//third_party/libyuv",

[mcasas, 2016/09/16 03:50:36]

Since this dependency is only necessary for
Linux/Cros, move it to somewhere between
l.95 and 136 and add an OS guard:

if (is_linux || is_chromeos) {
  deps += ["//third_party/libyuv"]
} 

[xianglu, 2016/09/16 18:22:33]

Done.

     "//ui/display",
     "//ui/gfx",
   ]
 
   configs += [
     # TODO(mcasas): media/base should be a component and not a source_set, but
     # it depends on parts of media/filters, media/ffmpeg etc. Until then, we
     # pretend to be inside media.dll and duplicate the few symbols needed, see
     # https://crbug.com/590017.
     "//media:media_implementation",
@@ skipping 69 matching lines @@
       "//media/capture/video/android",
       "//media/capture/video/android:capture_java",
     ]
   }
 
   if (is_win) {
     # TODO(jschuh): https://crbug.com/167187 fix size_t to int truncations.
     configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
   }
 }