Base: More adjustments to BASE_API and project dependencies to

base/metrics/nacl_histogram.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
 // nacl_histogram provides an enum and defines a macro that uses definitions
 // from histogram.h. Note that a histogram is an object that aggregates
 // statistics, and can summarize them in various forms, including ASCII
 // graphical, HTML, and numerically.
 // nacl_histogram information is used to compare how many times a native
 // client module has been loaded, compared to the number of chrome starts
 // and number of new tabs created.
 
 #ifndef BASE_METRICS_NACL_HISTOGRAM_H_
 #define BASE_METRICS_NACL_HISTOGRAM_H_
 #pragma once
 
+#include "base/base_api.h"
+
 enum NaClHistogramValue {
   FIRST_TAB_NACL_BASELINE,   // First tab created - a baseline for NaCl starts.
   NEW_TAB_NACL_BASELINE,     // New tab created -- a baseline for NaCl starts.
   NACL_STARTED,              // NaCl process started
   NACL_MAX_HISTOGRAM         // DO NOT USE -- used by histogram for max bound.
 };
 
 // To log histogram data about NaCl.Startups, call this macro with
 // a NaClHistogramValue passed in as |histogram_value|
-void UmaNaclHistogramEnumeration(NaClHistogramValue histogram_value);
+BASE_API void UmaNaclHistogramEnumeration(NaClHistogramValue histogram_value);
 
 #endif  // BASE_METRICS_NACL_HISTOGRAM_H_