Make android_deps material design private

Usages in internal repo have been fixed, so we should make the real
material design target private and only allow access to the public
alias.

Bug: 1110346
Change-Id: Id9bf2b705d51ef95eac6b2154c1d796369e4ec7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2347957
Commit-Queue: Peter Wen <wnwen@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797656}

third_party/android_deps/BUILD.gn

@@ -1385,6 +1385,10 @@ android_aar_prebuilt("com_google_android_material_material_java") {
 
   # Reduce binary size. https:crbug.com/954584
   ignore_proguard_configs = true
+
+  # Material Design is pulled in via Doubledown, thus this target should not
+  # be directly depended on. Please use :material_design_java instead.
+  visibility = [ ":*" ]
 }
 
 # This is generated, do not edit. Update BuildConfigGenerator.groovy instead.

third_party/android_deps/buildSrc/src/main/groovy/BuildConfigGenerator.groovy

@@ -344,6 +344,10 @@ class BuildConfigGenerator extends DefaultTask {
                 sb.append('\n')
                 sb.append('  # Reduce binary size. https:crbug.com/954584\n')
                 sb.append('  ignore_proguard_configs = true\n')
+                sb.append('\n')
+                sb.append('  # Material Design is pulled in via Doubledown, thus this target should not\n')
+                sb.append('  # be directly depended on. Please use :material_design_java instead.\n')
+                sb.append('  visibility = [ ":*" ]\n')
                 break
             case 'com_android_support_support_annotations':
                 sb.append('  # https://crbug.com/989505\n')