Bug 1555255 - Don't require a network connection to produce Javadoc. r=geckoview-reviewers,agi

See https://stackoverflow.com/a/24026735.

Adding the `docs` package requirement is not ideal, but it's not worth
the effort to install it only in automation (or in the relevant task),
and it's not *that* large: 1.0G on my macOS installation.

Differential Revision: https://phabricator.services.mozilla.com/D35834

--HG--
extra : moz-landing-system : lando

mobile/android/geckoview/build.gradle

@@ -273,7 +273,9 @@ android.libraryVariants.all { variant ->
             file("${System.properties['java.home']}/lib/rt.jar")] + android.bootClasspath
         options.memberLevel = JavadocMemberLevel.PROTECTED
         options.source = 8
-        options.links("https://d.android.com/reference/")
+        // Bug 1555255: don't require a network connection to produce Javadoc.
+        // See https://stackoverflow.com/a/24026735.
+        options.linksOffline("https://d.android.com/reference/", "${android.sdkDirectory}/docs/reference");
 
         options.docTitle = "GeckoView ${mozconfig.substs.MOZ_APP_VERSION} API"
         options.header = "GeckoView ${mozconfig.substs.MOZ_APP_VERSION} API"

python/mozboot/mozboot/android-packages.txt

@@ -2,3 +2,4 @@ platform-tools
 build-tools;27.0.3
 platforms;android-28
 emulator
+docs