Clang plugin to check that unstable types are not used in IPC.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index fc8295992c055c47b8692aa117d8395b8440091d..8de62cac9d1d0a456a51a1e1282052a1771deb0a 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -2228,6 +2228,11 @@
               # no need to load it dynamically.
               'clang_dynlib_flags%': '',
             }],
+            ['OS=="android"', {
+              'clang_plugin_args_ipc%': '-Xclang -plugin-arg-find-bad-constructs -Xclang check-ipc',
+            }, {
+              'clang_plugin_args_ipc%': '',
+            }],
           ],
           'clang_plugin_args%': '-Xclang -plugin-arg-find-bad-constructs -Xclang check-templates '
           '-Xclang -plugin-arg-find-bad-constructs -Xclang follow-macro-expansion ',
@@ -2235,7 +2240,7 @@
         # If you change these, also change build/config/clang/BUILD.gn.
         'clang_chrome_plugins_flags%':
           '<(clang_dynlib_flags)'
-          '-Xclang -add-plugin -Xclang find-bad-constructs <(clang_plugin_args)',
+          '-Xclang -add-plugin -Xclang find-bad-constructs <(clang_plugin_args) <(clang_plugin_args_ipc)',
       }],
       ['asan==1 or msan==1 or lsan==1 or tsan==1', {
         'clang%': 1,