Add use_v4lplugin flag to enable v4l2 library

content/content_common.gypi

 # Copyright (c) 2012 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../components/tracing.gyp:tracing',
     '../gpu/command_buffer/command_buffer.gyp:gles2_utils',
     '../net/net.gyp:net',
@@ skipping 735 matching lines @@
       'sources': [
         'common/gpu/media/android_video_encode_accelerator.cc',
         'common/gpu/media/android_video_encode_accelerator.h',
       ],
     }],
     ['enable_webrtc==1', {
       'dependencies': [
         '../third_party/libjingle/libjingle.gyp:libjingle',
       ],
     }],
+    ['use_v4lplugin==1 and chromeos==1', {
+      'defines': [
+        'USE_LIBV4L2',
+      ],
+      'variables': {
+        'generate_stubs_script': '../tools/generate_stubs/generate_stubs.py',
+        'extra_header': 'common/gpu/media/v4l2_stub_header.fragment',
+        'sig_files': ['common/gpu/media/v4l2.sig'],
+        'outfile_type': 'posix_stubs',
+        'stubs_filename_root': 'v4l2_stubs',
+        'project_path': 'content/common/gpu/media',
+        'intermediate_dir': '<(INTERMEDIATE_DIR)',
+        'output_root': '<(SHARED_INTERMEDIATE_DIR)/v4l2',
+      },
+      'include_dirs': [
+        '<(output_root)',
+        '<(DEPTH)/third_party/v4l-utils/lib/include',
+      ],
+      'actions': [
+        {
+          'action_name': 'generate_stubs',
+          'inputs': [
+            '<(generate_stubs_script)',
+            '<(extra_header)',
+            '<@(sig_files)',
+          ],
+          'outputs': [
+            '<(intermediate_dir)/<(stubs_filename_root).cc',
+            '<(output_root)/<(project_path)/<(stubs_filename_root).h',
+          ],
+          'action': ['python',
+            '<(generate_stubs_script)',
+            '-i', '<(intermediate_dir)',
+            '-o', '<(output_root)/<(project_path)',
+            '-t', '<(outfile_type)',
+            '-e', '<(extra_header)',
+            '-s', '<(stubs_filename_root)',
+            '-p', '<(project_path)',
+            '<@(_inputs)',
+          ],
+          'process_outputs_as_sources': 1,
+          'message': 'Generating libv4l2 stubs for dynamic loading',
+        },
+      ],
+    }],
     ['target_arch=="arm" and chromeos == 1 and use_x11 == 1', {
       'dependencies': [
         '../media/media.gyp:media',
       ],
       'sources': [
         'common/gpu/media/exynos_v4l2_video_device.cc',
         'common/gpu/media/exynos_v4l2_video_device.h',
         'common/gpu/media/tegra_v4l2_video_device.cc',
         'common/gpu/media/tegra_v4l2_video_device.h',
         'common/gpu/media/v4l2_image_processor.cc',
@@ skipping 160 matching lines @@
         'common/cursors/webcursor_ozone.cc',
         'common/font_list_ozone.cc',
         'common/gpu/client/gpu_memory_buffer_impl_ozone.cc',
         'common/gpu/client/gpu_memory_buffer_impl_ozone_native_buffer.cc',
         'common/gpu/client/gpu_memory_buffer_impl_ozone_native_buffer.h',
         'common/gpu/gpu_memory_buffer_factory_ozone.cc',
       ],
     }],
   ],
 }