Moving MediaApp to src/DEPS from src-internal.

Follow adapted version of: crbug/1051776
and https://chromium-review.googlesource.com/c/chromium/src/+/2182702
as migration plan:
Step 1: (This CL)
- add .gitignore entry for new path
- add entry to src/DEPS for MediaApp
- point references to app to the new entry

Step 2: (CL internal: https://chrome-internal-review.googlesource.com/c/chrome/src-internal/+/3089141)
- remove entry for app in src-internal/DEPS

Cq-Include-Trybots: chrome/try:linux-chromeos-chrome
Bug: 1080473

Change-Id: I942c3f24382b6c1c9ad0688364e932090ea3e5fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2230559
Auto-Submit: Jose Magana <jomag@chromium.org>
Commit-Queue: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#776494}

.gitignore

@@ -174,6 +174,7 @@ vs-chromium-project.txt
 /chromeos/assistant/internal
 /chromeos/components/help_app_ui/resources/app
 /chromeos/components/help_app_ui/resources/prod
+/chromeos/components/media_app_ui/resources/prod
 /chromeos/components/media_app_ui/resources/app
 /chromeos/components/media_app_ui/resources/pkg
 /chromeos/profiles/chromeos.orderfile.txt

DEPS

@@ -1539,6 +1539,17 @@ deps = {
     'dep_type': 'cipd',
   },
 
+  'src/chromeos/components/media_app_ui/resources/prod': {
+    'packages': [
+      {
+        'package': 'chromeos_internal/apps/media_app/app',
+        'version': 'F-avF4Ri2hix7udnvUw4Kpy8yj3WwML3J-8znYT-jvYC',
+      },
+    ],
+    'condition': 'checkout_chromeos and checkout_src_internal',
+    'dep_type': 'cipd',
+  },
+
   'src/third_party/google_android_play_core': {
       'packages': [
           {

chromeos/resources/BUILD.gn

@@ -132,8 +132,8 @@ grit("media_app_resources") {
 # Resources automatically served by the chrome://media-app bundle, obtained via DEPS.
 grit("media_app_bundle_resources") {
   if (enable_cros_media_app) {
-    # Obtained via src-internal/DEPS.
-    source = "../components/media_app_ui/resources/pkg/media_app_bundle_resources.grd"
+    # Obtained via an internal CIPD package in src/DEPS.
+    source = "../components/media_app_ui/resources/prod/media_app_bundle_resources.grd"
   } else {
     source = "../components/media_app_ui/resources/mock/media_app_bundle_mock_resources.grd"
   }

tools/gritsettings/resource_ids.spec

@@ -307,7 +307,7 @@
   # start with the same id because only one of them is built depending on if
   # src_internal is available. Lower bound for number of resource ids is number
   # of languages (74).
-  "chromeos/components/media_app_ui/resources/pkg/media_app_bundle_resources.grd": {
+  "chromeos/components/media_app_ui/resources/prod/media_app_bundle_resources.grd": {
     "META": {"sizes": {"includes": [120],}},  # Relies on src-internal.
     "includes": [2580],
   },