GN(android): Fix up support for is_asan=true

build/config/sanitizers/BUILD.gn

Index: build/config/sanitizers/BUILD.gn
diff --git a/build/config/sanitizers/BUILD.gn b/build/config/sanitizers/BUILD.gn
index 19d0a3ff856c0f27e4035a0e596be7e3479f52e9..c958e2d3e2ed922ee2e5af0f4dab913aa03aa0a5 100644
--- a/build/config/sanitizers/BUILD.gn
+++ b/build/config/sanitizers/BUILD.gn
@@ -102,8 +102,21 @@ config("default_sanitizer_flags") {
         "-fsanitize=address",
         "-fsanitize-blacklist=$asan_blacklist_path",
       ]
-      if (is_mac) {
-        cflags += [ "-mllvm -asan-globals=0" ]  # http://crbug.com/352073
+      if (is_android) {
+        # Android build relies on -Wl,--gc-sections removing unreachable code.
+        # ASan instrumentation for globals inhibits this and results in a
+        # library with unresolvable relocations.
+        # TODO(eugenis): find a way to reenable this.
+        cflags += [
+          "-mllvm",
+          "-asan-globals=0",
+        ]
+      } else if (is_mac) {
+        # http://crbug.com/352073
+        cflags += [
+          "-mllvm",
+          "-asan-globals=0",
+        ]
         # TODO(GYP): deal with mac_bundles.
       }
     }