[Android WebAPK] Create resources for web shortcuts.

Resources used need to be pre-declared in the shell.

Since we don't know how many shortcuts are needed for a web app until
the creation request, we create 4 copies of the needed resources to
declare a shortcut, since that is the maximum number of shortcuts
allowed on Android.

The following resources are needed (per shortcut):
- name
- short_name
- icon (placeholder taken from
    https://material.io/resources/icons/?icon=filter_1&style=baseline)

The shortcuts.xml is also partially generated to use the resources, so
that building the shell apk doesn't fail. They are all disabled by
default, and will need to be re-enabled on the server-side.

Bug: 1010471
Change-Id: I5371b145afd943029de8eb679b0cf3044545cbe3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1875755Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Glenn Hartmann <hartmanng@chromium.org>
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709189}

chrome/android/webapk/shell_apk/current_version/current_version.gni

@@ -12,4 +12,4 @@
 # //chrome/android/webapk/shell_apk:webapk is changed. This includes
 # Java files, Android resource files and AndroidManifest.xml. Does not affect
 # Chrome.apk
-current_shell_apk_version = 111
+current_shell_apk_version = 112

chrome/android/webapk/shell_apk/res/xml/shortcuts.xml

 <shortcuts xmlns:android='http://schemas.android.com/apk/res/android'>
-    {{{shortcuts}}}
+
+  {{#shortcut_1}}
+  <shortcut
+    android:shortcutId='shortcut_1'
+    android:icon='@drawable/shortcut_1_icon'
+    android:shortcutShortLabel='@string/shortcut_1_short_name'
+    android:shortcutLongLabel='@string/shortcut_1_name'>
+      <intent
+          android:action='android.intent.action.MAIN'
+          android:targetPackage='{{{manifest_package}}}'
+          android:targetClass='{{{target_class}}}'
+          android:data='{{{launch_url}}}' />
+  </shortcut>
+  {{/shortcut_1}}
+
+  {{#shortcut_2}}
+  <shortcut
+    android:shortcutId='shortcut_2'
+    android:icon='@drawable/shortcut_2_icon'
+    android:shortcutShortLabel='@string/shortcut_2_short_name'
+    android:shortcutLongLabel='@string/shortcut_2_name'>
+      <intent
+          android:action='android.intent.action.MAIN'
+          android:targetPackage='{{{manifest_package}}}'
+          android:targetClass='{{{target_class}}}'
+          android:data='{{{launch_url}}}' />
+  </shortcut>
+  {{/shortcut_2}}
+
+  {{#shortcut_3}}
+  <shortcut
+    android:shortcutId='shortcut_3'
+    android:icon='@drawable/shortcut_3_icon'
+    android:shortcutShortLabel='@string/shortcut_3_short_name'
+    android:shortcutLongLabel='@string/shortcut_3_name'>
+      <intent
+          android:action='android.intent.action.MAIN'
+          android:targetPackage='{{{manifest_package}}}'
+          android:targetClass='{{{target_class}}}'
+          android:data='{{{launch_url}}}' />
+  </shortcut>
+  {{/shortcut_3}}
+
+  {{#shortcut_4}}
+  <shortcut
+    android:shortcutId='shortcut_4'
+    android:icon='@drawable/shortcut_4_icon'
+    android:shortcutShortLabel='@string/shortcut_4_short_name'
+    android:shortcutLongLabel='@string/shortcut_4_name'>
+      <intent
+          android:action='android.intent.action.MAIN'
+          android:targetPackage='{{{manifest_package}}}'
+          android:targetClass='{{{target_class}}}'
+          android:data='{{{launch_url}}}' />
+  </shortcut>
+  {{/shortcut_4}}
 </shortcuts>

chrome/android/webapk/strings/android_webapk_strings.grd

@@ -139,6 +139,30 @@
       <message name="IDS_NOTIFICATION_CHANNEL_NAME" desc="The user visible name of the default notification channel of the WebAPK.">
         General
       </message>
+      <message name="IDS_SHORTCUT_1_NAME" desc="The name of the first shortcut." translateable="false">
+        Shortcut 1
+      </message>
+      <message name="IDS_SHORTCUT_1_SHORT_NAME" desc="The short name of the first shortcut." translateable="false">
+        Shortcut 1
+      </message>
+      <message name="IDS_SHORTCUT_2_NAME" desc="The name of the second shortcut." translateable="false">
+        Shortcut 2
+      </message>
+      <message name="IDS_SHORTCUT_2_SHORT_NAME" desc="The short name of the second shortcut." translateable="false">
+        Shortcut 2
+      </message>
+      <message name="IDS_SHORTCUT_3_NAME" desc="The name of the third shortcut." translateable="false">
+        Shortcut 3
+      </message>
+      <message name="IDS_SHORTCUT_3_SHORT_NAME" desc="The short name of the third shortcut." translateable="false">
+        Shortcut 3
+      </message>
+      <message name="IDS_SHORTCUT_4_NAME" desc="The name of the fourth shortcut." translateable="false">
+        Shortcut 4
+      </message>
+      <message name="IDS_SHORTCUT_4_SHORT_NAME" desc="The short name of the fourth shortcut." translateable="false">
+        Shortcut 4
+      </message>
     </messages>
   </release>
 </grit>