Update API for Objective-C RTCStats.

BUG=
R=tkchin@webrtc.org

Review URL: https://codereview.webrtc.org/1540113002 .

Patch from Jon Hjelle <hjon@andyet.net>.

Cr-Commit-Position: refs/heads/master@{#11207}

webrtc/api/BUILD.gn

@@ -32,6 +32,9 @@ if (is_ios) {
       "objc/RTCSessionDescription+Private.h",
       "objc/RTCSessionDescription.h",
       "objc/RTCSessionDescription.mm",
+      "objc/RTCStatsReport+Private.h",
+      "objc/RTCStatsReport.h",
+      "objc/RTCStatsReport.mm",
       "objc/RTCVideoFrame+Private.h",
       "objc/RTCVideoFrame.h",
       "objc/RTCVideoFrame.mm",

webrtc/api/api.gyp

@@ -31,6 +31,9 @@
             'objc/RTCSessionDescription+Private.h',
             'objc/RTCSessionDescription.h',
             'objc/RTCSessionDescription.mm',
+            'objc/RTCStatsReport+Private.h',
+            'objc/RTCStatsReport.h',
+            'objc/RTCStatsReport.mm',
             'objc/RTCVideoFrame+Private.h',
             'objc/RTCVideoFrame.h',
             'objc/RTCVideoFrame.mm',

webrtc/api/objc/RTCStatsReport+Private.h

@@ -0,0 +1,24 @@
+/*
+ *  Copyright 2015 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.
+ */
+
+#import "RTCStatsReport.h"
+
+#include "talk/app/webrtc/statstypes.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface RTCStatsReport ()
+
+/** Initialize an RTCStatsReport object from a native StatsReport. */
+- (instancetype)initWithNativeReport:(const webrtc::StatsReport &)nativeReport;
+
+@end
+
+NS_ASSUME_NONNULL_END

webrtc/api/objc/RTCStatsReport.h

@@ -0,0 +1,34 @@
+/*
+ *  Copyright 2015 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.
+ */
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/** This does not currently conform to the spec. */
+@interface RTCStatsReport : NSObject
+
+/** Time since 1970-01-01T00:00:00Z in milliseconds. */
+@property(nonatomic, readonly) CFTimeInterval timestamp;
+
+/** The type of stats held by this object. */
+@property(nonatomic, readonly) NSString *type;
+
+/** The identifier for this object. */
+@property(nonatomic, readonly) NSString *statsId;
+
+/** A dictionary holding the actual stats. */
+@property(nonatomic, readonly) NSDictionary<NSString *, NSString *> *values;
+
+- (instancetype)init NS_UNAVAILABLE;
+
+@end
+
+NS_ASSUME_NONNULL_END

webrtc/api/objc/RTCStatsReport.mm

@@ -0,0 +1,62 @@
+/*
+ *  Copyright 2015 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.
+ */
+
+#import "RTCStatsReport.h"
+
+#include "webrtc/base/checks.h"
+
+#import "webrtc/api/objc/RTCStatsReport+Private.h"
+#import "webrtc/base/objc/NSString+StdString.h"
+#import "webrtc/base/objc/RTCLogging.h"
+
+@implementation RTCStatsReport
+
+@synthesize timestamp = _timestamp;
+@synthesize type = _type;
+@synthesize statsId = _statsId;
+@synthesize values = _values;
+
+- (NSString *)description {
+  return [NSString stringWithFormat:@"RTCStatsReport:\n%@\n%@\n%f\n%@",
+                                    _statsId,
+                                    _type,
+                                    _timestamp,
+                                    _values];
+}
+
+#pragma mark - Private
+
+- (instancetype)initWithNativeReport:(const webrtc::StatsReport &)nativeReport {
+  if (self = [super init]) {
+    _timestamp = nativeReport.timestamp();
+    _type = [NSString stringForStdString:nativeReport.TypeToString()];
+    _statsId = [NSString stringForStdString:
+        nativeReport.id()->ToString()];
+
+    NSUInteger capacity = nativeReport.values().size();
+    NSMutableDictionary *values =
+        [NSMutableDictionary dictionaryWithCapacity:capacity];
+    for (auto const &valuePair : nativeReport.values()) {
+      NSString *key = [NSString stringForStdString:
+          valuePair.second->display_name()];
+      NSString *value = [NSString stringForStdString:
+          valuePair.second->ToString()];
+
+      // Not expecting duplicate keys.
+      RTC_DCHECK(values[key]);
+
+      values[key] = value;
+    }
+    _values = values;
+  }
+  return self;
+}
+
+@end