Refactor OS_LINUX preprocessor directive for LaCrOS effort.

Currently, ChromeOS defines the OS_LINUX directive as well as
OS_CHROMEOS.  We're working to separate these two, so we're
making the fact that OS_LINUX == OS_LINUX || OS_CHROMEOS
explicit.

This is changes for /media/capture/video

This CL was uploaded by git cl split.

R=guidou@chromium.org

Bug: 1110266
Change-Id: I73819505c21053585355c83e9f13e48aa386fa9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2370729Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Sean McAllister <smcallis@google.com>
Cr-Commit-Position: refs/heads/master@{#801406}

media/capture/video/fake_video_capture_device_factory.cc

@@ -208,7 +208,7 @@ void FakeVideoCaptureDeviceFactory::GetDevicesInfo(
   int entry_index = 0;
   for (const auto& entry : devices_config_) {
     VideoCaptureApi api =
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_CHROMEOS)
         VideoCaptureApi::LINUX_V4L2_SINGLE_PLANE;
 #elif defined(OS_MAC)
         VideoCaptureApi::MACOSX_AVFOUNDATION;

media/capture/video/file_video_capture_device_factory.cc

@@ -52,7 +52,7 @@ void FileVideoCaptureDeviceFactory::GetDevicesInfo(
       VideoCaptureApi::WIN_DIRECT_SHOW;
 #elif defined(OS_MAC)
       VideoCaptureApi::MACOSX_AVFOUNDATION;
-#elif defined(OS_LINUX)
+#elif defined(OS_LINUX) || defined(OS_CHROMEOS)
       VideoCaptureApi::LINUX_V4L2_SINGLE_PLANE;
 #else
       VideoCaptureApi::UNKNOWN;

media/capture/video/video_capture_buffer_pool_impl.cc

@@ -58,7 +58,7 @@ VideoCaptureBufferPoolImpl::CreateSharedMemoryViaRawFileDescriptorStruct(
     int buffer_id) {
 // This requires platforms where base::SharedMemoryHandle is backed by a
 // file descriptor.
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_CHROMEOS)
   base::AutoLock lock(lock_);
 
   VideoCaptureBufferTracker* tracker = GetTracker(buffer_id);

media/capture/video/video_capture_device_client.cc

@@ -301,7 +301,7 @@ void VideoCaptureDeviceClient::OnIncomingCapturedData(
 // see http://linuxtv.org/downloads/v4l-dvb-apis/packed-rgb.html.
 // Windows RGB24 defines blue at lowest byte,
 // see https://msdn.microsoft.com/en-us/library/windows/desktop/dd407253
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_CHROMEOS)
       fourcc_format = libyuv::FOURCC_RAW;
 #elif defined(OS_WIN)
       fourcc_format = libyuv::FOURCC_24BG;

media/capture/video/video_capture_device_client_unittest.cc

@@ -227,7 +227,7 @@ TEST_F(VideoCaptureDeviceClientTest, DataCaptureGoodPixelFormats) {
     PIXEL_FORMAT_NV21,
     PIXEL_FORMAT_YUY2,
     PIXEL_FORMAT_UYVY,
-#if defined(OS_WIN) || defined(OS_LINUX)
+#if defined(OS_WIN) || defined(OS_LINUX) || defined(OS_CHROMEOS)
     PIXEL_FORMAT_RGB24,
 #endif
     PIXEL_FORMAT_ARGB,