Android: Add chrome-specific dynamic linker.

content/app/android/library_loader_hooks.cc

 // Copyright (c) 2012 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 "content/public/app/android_library_loader_hooks.h"
 
 #include "base/android/base_jni_registrar.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_registrar.h"
 #include "base/android/jni_string.h"
 #include "base/at_exit.h"
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
+#include "base/metrics/histogram.h"
 #include "base/strings/string_util.h"
 #include "base/tracked_objects.h"
 #include "content/app/android/app_jni_registrar.h"
 #include "content/browser/android/browser_jni_registrar.h"
 #include "content/child/android/child_jni_registrar.h"
 #include "content/common/android/command_line.h"
 #include "content/common/android/common_jni_registrar.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/result_codes.h"
 #include "jni/LibraryLoader_jni.h"
@@ skipping 73 matching lines @@
 
   if (!content::android::RegisterAppJni(env))
     return RESULT_CODE_FAILED_TO_REGISTER_JNI;
 
   if (!media::RegisterJni(env))
     return RESULT_CODE_FAILED_TO_REGISTER_JNI;
 
   return 0;
 }
 
+static void RecordContentAndroidLinkerHistogram(
+    JNIEnv* env,
+    jclass clazz,
+    jboolean loaded_at_fixed_address_failed,
+    jboolean is_low_memory_device) {
+  UMA_HISTOGRAM_BOOLEAN("ContentAndroidLinker.LoadedAtFixedAddressFailed",
+                        loaded_at_fixed_address_failed);
+  UMA_HISTOGRAM_BOOLEAN("ContentAndroidLinker.IsLowMemoryDevice",
+                        is_low_memory_device);
+}
+
 void LibraryLoaderExitHook() {
   if (g_at_exit_manager) {
     delete g_at_exit_manager;
     g_at_exit_manager = NULL;
   }
 }
 
 bool RegisterLibraryLoaderEntryHook(JNIEnv* env) {
   // We need the AtExitManager to be created at the very beginning.
   g_at_exit_manager = new base::AtExitManager();
 
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content