Enable template checking for the clang plugin on Android.

This enables the plugin to check templated classes for the following
things:
- Refcounted types have private destructors.
- WeakPtrFactory members are the last members

BUG=441916

Review URL: https://codereview.chromium.org/1162623003

Cr-Original-Commit-Position: refs/heads/master@{#331907}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: b0dad9e37be79905855ac637a041429775582edd

common.gypi

@@ -2182,7 +2182,7 @@
               'clang_dynlib_flags%': '',
             }],
             # https://crbug.com/441916
-            ['OS=="linux" or OS=="mac"', {
+            ['OS=="android" or OS=="linux" or OS=="mac"', {
               'clang_plugin_args%': '-Xclang -plugin-arg-find-bad-constructs -Xclang check-templates ',
             }, { # OS != "linux"
               'clang_plugin_args%': ''

config/clang/BUILD.gn

@@ -32,7 +32,7 @@ config("find_bad_constructs") {
     }
 
     # https://crbug.com/441916
-    if (is_linux || is_mac) {
+    if (is_android || is_linux || is_mac) {
       cflags += [
         "-Xclang",
         "-plugin-arg-find-bad-constructs",