Enable DMP for system Chromium WebView on Android

third_party/tcmalloc/chromium/src/libc_override_gcc_and_weak.h

Index: third_party/tcmalloc/chromium/src/libc_override_gcc_and_weak.h
diff --git a/third_party/tcmalloc/chromium/src/libc_override_gcc_and_weak.h b/third_party/tcmalloc/chromium/src/libc_override_gcc_and_weak.h
index 3b858caa444261e5d36e6586fb3f39eb46c29907..40410c2cee768fabcfc26b6b3b169e5bf6071b75 100644
--- a/third_party/tcmalloc/chromium/src/libc_override_gcc_and_weak.h
+++ b/third_party/tcmalloc/chromium/src/libc_override_gcc_and_weak.h
@@ -94,7 +94,13 @@ extern "C" {
   struct mallinfo mallinfo(void) __THROW          ALIAS(tc_mallinfo);
 #endif
   size_t malloc_size(void* p) __THROW             ALIAS(tc_malloc_size);
+#if defined(__ANDROID__) && defined(__SIGN)
+  // This combination means that we are building inside the Android tree,
+  // which defines this function differently from the NDK.
+  size_t malloc_usable_size(const void* p) __THROW      ALIAS(tc_malloc_size);
+#else
   size_t malloc_usable_size(void* p) __THROW      ALIAS(tc_malloc_size);
+#endif
 }   // extern "C"
 
 #undef ALIAS