Rationalize and fix chromium android linker histogram recording.

base/android/library_loader/library_loader_hooks.h

 // 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.
 
 #ifndef BASE_ANDROID_LIBRARY_LOADER_HOOKS_H_
 #define BASE_ANDROID_LIBRARY_LOADER_HOOKS_H_
 
 #include <jni.h>
 
 #include "base/base_export.h"
 
 namespace base {
 namespace android {
 
+// Register whether loading a renderer at a fixed address failed in the
+// chromium android linker. This value cannot be recorded when it arises
+// because histogram reporting is not available that early in the process
+// lifecycle. A call to this function retains the value, for later recording
+// as a histogram.
+BASE_EXPORT void RegisterChromiumAndroidLinkerRendererHistogram(
+    bool load_at_fixed_address_failed);
+
+// Record a value passed to RegisterChromiumAndroidLinkerRendererHistogram
+// as a histogram.
+BASE_EXPORT void RecordChromiumAndroidLinkerRendererHistogram();
+
 // Registers the callbacks that allows the entry point of the library to be
 // exposed to the calling java code.  This handles only registering the
 // the callbacks needed by the loader. Any application specific JNI bindings
 // should happen once the native library has fully loaded, either in the library
 // loaded hook function or later.
 BASE_EXPORT bool RegisterLibraryLoaderEntryHook(JNIEnv* env);
 
 // Typedef for hook function to be called (indirectly from Java) once the
 // libraries are loaded. The hook function should register the JNI bindings
 // required to start the application. It should return true for success and
@@ skipping 16 matching lines @@
 BASE_EXPORT void SetVersionNumber(const char* version_number);
 
 // Call on exit to delete the AtExitManager which OnLibraryLoadedOnUIThread
 // created.
 BASE_EXPORT void LibraryLoaderExitHook();
 
 }  // namespace android
 }  // namespace base
 
 #endif  // BASE_ANDROID_LIBRARY_LOADER_HOOKS_H_