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--- a/build/build_config.h
+++ b/build/build_config.h
@@ -16,6 +16,43 @@
#ifndef BUILD_BUILD_CONFIG_H_
#define BUILD_BUILD_CONFIG_H_
+// A brief primer on #defines:
+//
+// - __ANDROID__ is automatically defined by the Android toolchain (see
+// https://goo.gl/v61lXa). It's not defined when building host code.
+// - __ANDROID_HOST__ is defined via -D by Android.mk when building host code
+// within an Android checkout.
+// - ANDROID is defined via -D when building code for either Android targets or
+// hosts. Use __ANDROID__ and __ANDROID_HOST__ instead.
+// - OS_ANDROID is a Chrome-specific define used to build Chrome for Android
+// within the NDK.
+
+// Android targets and hosts don't use tcmalloc.
+#if defined(__ANDROID__) || defined(__ANDROID_HOST__)
+#define NO_TCMALLOC
+#endif // defined(__ANDROID__) || defined(__ANDROID_HOST__)
+
+// Use the Chrome OS version of the code for both Android targets and Chrome OS builds.
+#if !defined(__ANDROID_HOST__)
+#define OS_CHROMEOS 1
+#endif // !defined(__ANDROID_HOST__)
+
+#if defined(__ANDROID__) // Android targets
+
+#define __linux__ 1
+#if defined(__BIONIC__)
+#define __UCLIBC__ 1
+#endif // defined(__BIONIC__)
+
+#elif !defined(__ANDROID_HOST__) // Chrome OS
+
+// TODO: Remove these once the GLib MessageLoopForUI isn't being used:
+// https://crbug.com/361635
+#define USE_GLIB 1
+#define USE_OZONE 1
+
+#endif // defined(__ANDROID__)
+
// A set of macros to use for platform detection.
#if defined(__native_client__)
// __native_client__ must be first, so that other OS_ defines are not set.
@@ -28,8 +65,7 @@
#else
#define OS_NACL_SFI
#endif
-#elif defined(ANDROID)
-#define OS_ANDROID 1
+// Don't set OS_ANDROID; it's only used when building Chrome for Android.
#elif defined(__APPLE__)
// only include TargetConditions after testing ANDROID as some android builds
// on mac don't have this header available and it's not needed unless the target
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