Split UserMetrics into API vs. implementation. Move API to content/public.

content/content_browser.gypi

 # 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../net/net.gyp:http_server',
     '../net/net.gyp:net',
@@ skipping 41 matching lines @@
     'public/browser/plugin_data_remover.h',
     'public/browser/profiler_controller.h',
     'public/browser/profiler_subscriber.h',
     'public/browser/render_process_host.h',
     'public/browser/render_process_host_factory.h',
     'public/browser/render_view_host_observer.cc',
     'public/browser/render_view_host_observer.h',
     'public/browser/resource_dispatcher_host_delegate.h',
     'public/browser/sensors.h',
     'public/browser/sensors_listener.h',
+    'public/browser/user_metrics.h',
     'browser/accessibility/browser_accessibility.cc',
     'browser/accessibility/browser_accessibility.h',
     'browser/accessibility/browser_accessibility_cocoa.h',
     'browser/accessibility/browser_accessibility_cocoa.mm',
     'browser/accessibility/browser_accessibility_delegate_mac.h',
     'browser/accessibility/browser_accessibility_mac.h',
     'browser/accessibility/browser_accessibility_mac.mm',
     'browser/accessibility/browser_accessibility_manager.cc',
     'browser/accessibility/browser_accessibility_manager.h',
     'browser/accessibility/browser_accessibility_manager_mac.h',
@@ skipping 536 matching lines @@
     'browser/tab_contents/web_drag_source_gtk.h',
     'browser/tab_contents/web_drag_source_mac.h',
     'browser/tab_contents/web_drag_source_mac.mm',
     'browser/trace_controller.cc',
     'browser/trace_controller.h',
     'browser/trace_message_filter.cc',
     'browser/trace_message_filter.h',
     'browser/trace_subscriber_stdio.cc',
     'browser/trace_subscriber_stdio.h',
     'browser/user_metrics.cc',
-    'browser/user_metrics.h',
     'browser/utility_process_host.cc',
     'browser/utility_process_host.h',
     'browser/webui/empty_web_ui_factory.cc',
     'browser/webui/empty_web_ui_factory.h',
     'browser/webui/generic_handler.cc',
     'browser/webui/generic_handler.h',
     'browser/webui/web_ui.cc',
     'browser/webui/web_ui.h',
     'browser/webui/web_ui_factory.cc',
     'browser/webui/web_ui_factory.h',
@@ skipping 166 matching lines @@
         'ENABLE_JAVA_BRIDGE',
       ],
     }, {
       'sources/': [
         ['exclude', '^browser/renderer_host/java/'],
       ],
     }],
   ],
 }