Refactor: Make MediaCaptureDevicesDispatcher have pluggable handlers.

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 2d6a49b394be1d53d7554573643ac7ccb141f380..0b75a3a09a80ef4d54cd6116706aa3a95aa36a5d 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -508,6 +508,10 @@
       'browser/media/desktop_media_picker.h',
       'browser/media/desktop_streams_registry.cc',
       'browser/media/desktop_streams_registry.h',
+      'browser/media/desktop_capture_access_handler.cc',
+      'browser/media/desktop_capture_access_handler.h',
+      'browser/media/media_access_handler.cc',
+      'browser/media/media_access_handler.h',
       'browser/media/media_capture_devices_dispatcher.cc',
       'browser/media/media_capture_devices_dispatcher.h',
       'browser/media/media_device_id_salt.cc',
@@ -528,6 +532,10 @@
       'browser/media/midi_permission_infobar_delegate.h',
       'browser/media/native_desktop_media_list.cc',
       'browser/media/native_desktop_media_list.h',
+      'browser/media/regular_media_access_handler.cc',
+      'browser/media/regular_media_access_handler.h',
+      'browser/media/tab_capture_access_handler.cc',
+      'browser/media/tab_capture_access_handler.h',
       # TODO(brettw) should this go with the webrtc sources?
       'browser/media/webrtc_log_list.cc',
       'browser/media/webrtc_log_list.h',
@@ -3174,6 +3182,14 @@
             # chrome/browser/metrics/variations/generate_resources_map.py
             '<(SHARED_INTERMEDIATE_DIR)/chrome/browser/metrics/variations/generated_resources_map.cc',
           ],
+          'conditions' : [
+            ['enable_extensions==1', {
+              'sources': [
+                'browser/media/extension_media_access_handler.cc',

[Lei Zhang, 2015/04/24 18:39:17]

Just put these in the 'chrome_browser_extensions_sources' section.

[changbin, 2015/04/29 05:24:35]

Thanks, done.

+                'browser/media/extension_media_access_handler.h',
+              ],
+            }],
+          ],
         }, {  # OS == "ios"
           'dependencies': [
             '../net/net.gyp:net',