Add ObjC API for getting native histograms.

webrtc/sdk/sdk.gyp

 # Copyright 2016 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 {
   'includes': [
@@ skipping 19 matching lines @@
               'objc/Framework/Classes',
               'objc/Framework/Headers',
             ],
           },
           'sources': [
             'objc/Framework/Classes/NSString+StdString.h',
             'objc/Framework/Classes/NSString+StdString.mm',
             'objc/Framework/Classes/RTCDispatcher.m',
             'objc/Framework/Classes/RTCFieldTrials.mm',
             'objc/Framework/Classes/RTCLogging.mm',
+            'objc/Framework/Classes/RTCMetric+Private.h',
+            'objc/Framework/Classes/RTCMetric.mm',
             'objc/Framework/Classes/RTCSSLAdapter.mm',
             'objc/Framework/Classes/RTCTracing.mm',
             'objc/Framework/Headers/WebRTC/RTCDispatcher.h',
             'objc/Framework/Headers/WebRTC/RTCFieldTrials.h',
             'objc/Framework/Headers/WebRTC/RTCLogging.h',
             'objc/Framework/Headers/WebRTC/RTCMacros.h',
+            'objc/Framework/Headers/WebRTC/RTCMetric.h',
             'objc/Framework/Headers/WebRTC/RTCSSLAdapter.h',
             'objc/Framework/Headers/WebRTC/RTCTracing.h',
           ],
           'conditions': [
             ['OS=="ios"', {
               'sources': [
                 'objc/Framework/Classes/RTCCameraPreviewView.m',
                 'objc/Framework/Classes/RTCUIApplication.h',
                 'objc/Framework/Classes/RTCUIApplication.mm',
                 'objc/Framework/Headers/WebRTC/RTCCameraPreviewView.h',
@@ skipping 242 matching lines @@
               'mac_framework_headers!': [
                 'objc/Framework/Headers/WebRTC/RTCFileLogger.h',
               ],
             }],
           ],  # conditions
         }, # rtc_sdk_framework_objc
       ],  # targets
     }],  # OS=="ios" or (OS=="mac" and mac_deployment_target=="10.7")
   ],
 }