[Android] Add gn support for multidex.
BUG=272790
Review URL: https://codereview.chromium.org/1451483002
Cr-Commit-Position: refs/heads/master@{#360943}
CrOS-Libchrome-Original-Commit: e6361975d7f7f4c434dc3380a3824b9d5e323d20
diff --git a/base/android/java/templates/ChromiumMultiDex.template b/base/android/java/templates/ChromiumMultiDex.template
index 18b3c77..5761a45 100644
--- a/base/android/java/templates/ChromiumMultiDex.template
+++ b/base/android/java/templates/ChromiumMultiDex.template
@@ -22,15 +22,21 @@
private static final String TAG = "base_multidex";
/**
- * Installs secondary dexes if possible.
+ * Installs secondary dexes if possible/necessary.
*
* Isolated processes (e.g. renderer processes) can't load secondary dex files on
* K and below, so we don't even try in that case.
*
+ * In release builds, this is a no-op because:
+ * - multidex isn't necessary in release builds because we run proguard there and
+ * thus aren't threatening to hit the dex limit; and
+ * - calling MultiDex.install, even in the absence of secondary dexes, causes a
+ * significant regression in start-up time (crbug.com/525695).
+ *
* @param context The application context.
*/
@VisibleForTesting
-#if defined(CONFIGURATION_NAME_Debug)
+#if defined(MULTIDEX_CONFIGURATION_Debug)
public static void install(Context context) {
try {
// TODO(jbudorick): Back out this version check once support for K & below works.