[Android WebAPK] Allow WAM to set has_maskable_icon

Previously, when Chrome checks if a WebAPK needs update,
the has_maskable_icon value in its Android manifest is
mistakenly fixed to true. This CL allows WAM server to
set the has_maskable_icon value based on actaully manifest
data.

Bug: 977173
Change-Id: I7ebebb323c5544ed7a8ac71c4231c7745917a001
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1885311
Commit-Queue: Henry Jian <hzjian@google.com>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710819}

chrome/android/webapk/shell_apk/AndroidManifest.xml

@@ -134,7 +134,9 @@
 
         <meta-data android:name="org.chromium.webapk.shell_apk.defaultBackgroundColorId" android:resource="@color/webapp_default_bg" />
         <meta-data android:name="org.chromium.webapk.shell_apk.iconId" android:resource="@mipmap/app_icon" />
+        {{#has_maskable_icon}}
         <meta-data android:name="org.chromium.webapk.shell_apk.maskableIconId" android:resource="@mipmap/maskable_app_icon"/>
+        {{/has_maskable_icon}}
         <meta-data android:name="org.chromium.webapk.shell_apk.splashId" android:resource="@drawable/splash_icon" />
         <meta-data android:name="org.chromium.webapk.shell_apk.isSplashIconMaskableBooleanId" android:resource="@bool/is_splash_icon_maskable"/>
         <meta-data android:name="org.chromium.webapk.shell_apk.distributor" android:value="{{{distributor}}}" />

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 = 114
+current_shell_apk_version = 115

chrome/android/webapk/shell_apk/manifest/bound_manifest_config.json

@@ -36,5 +36,6 @@
           "mime_types": [{
             "mime_type": "image/*"
           }]
-  }]
+  }],
+  "has_maskable_icon": true
 }