Add UMA for testing whether the Chromium library was page aligned in the APK file.

base/android/library_loader/library_loader_hooks.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/android/library_loader/library_loader_hooks.h"
 
 #include "base/android/command_line_android.h"
 #include "base/android/jni_string.h"
 #include "base/android/library_loader/library_load_from_apk_status_codes.h"
 #include "base/at_exit.h"
@@ skipping 80 matching lines @@
   UMA_HISTOGRAM_ENUMERATION("ChromiumAndroidLinker.BrowserStates",
                             histogram_code,
                             MAX_BROWSER_HISTOGRAM_CODE);
 
   // Record the device support for loading a library directly from the APK file.
   UMA_HISTOGRAM_ENUMERATION("ChromiumAndroidLinker.LibraryLoadFromApkStatus",
                             library_load_from_apk_status,
                             LIBRARY_LOAD_FROM_APK_STATUS_CODES_MAX);
 }
 
+static void RecordChromiumAndroidLinkerLibraryAlignmentInApk(
+    JNIEnv* env,
+    jclass clazz,
+    jboolean aligned) {
+  // Record whether the Chromium library is page aligned in the APK file.
+  UMA_HISTOGRAM_BOOLEAN("ChromiumAndroidLinker.LibraryAlignedInApk", aligned);
+}
+
 void SetLibraryLoadedHook(LibraryLoadedHook* func) {
   g_registration_callback = func;
 }
 
 static void InitCommandLine(JNIEnv* env, jclass clazz,
                             jobjectArray init_command_line) {
   InitNativeCommandLineFromJavaArray(env, init_command_line);
 }
 
 static jboolean LibraryLoaded(JNIEnv* env, jclass clazz) {
@@ skipping 24 matching lines @@
 jstring GetVersionNumber(JNIEnv* env, jclass clazz) {
   return ConvertUTF8ToJavaString(env, g_library_version_number).Release();
 }
 
 static void RecordNativeLibraryHack(JNIEnv*, jclass, jboolean usedHack) {
   UMA_HISTOGRAM_BOOLEAN("LibraryLoader.NativeLibraryHack", usedHack);
 }
 
 }  // namespace android
 }  // namespace base