Reland of Split iOS sdk in to separate targets

webrtc/sdk/objc/Framework/Classes/Common/RTCFieldTrials.mm

Index: webrtc/sdk/objc/Framework/Classes/Common/RTCFieldTrials.mm
diff --git a/webrtc/sdk/objc/Framework/Classes/Common/RTCFieldTrials.mm b/webrtc/sdk/objc/Framework/Classes/Common/RTCFieldTrials.mm
new file mode 100644
index 0000000000000000000000000000000000000000..28ce5414bd9fdd8ec9f92c471db071e0713cc9e2
--- /dev/null
+++ b/webrtc/sdk/objc/Framework/Classes/Common/RTCFieldTrials.mm
@@ -0,0 +1,67 @@
+/*
+ *  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.
+ */
+
+#import "WebRTC/RTCFieldTrials.h"
+
+#include <memory>
+
+#import "WebRTC/RTCLogging.h"
+
+// Adding 'nogncheck' to disable the gn include headers check.
+// We don't want to depend on 'system_wrappers:field_trial_default' because
+// clients should be able to provide their own implementation.
+#include "webrtc/system_wrappers/include/field_trial_default.h"  // nogncheck
+
+NSString * const kRTCFieldTrialAudioSendSideBweKey = @"WebRTC-Audio-SendSideBwe";
+NSString * const kRTCFieldTrialSendSideBweWithOverheadKey = @"WebRTC-SendSideBwe-WithOverhead";
+NSString * const kRTCFieldTrialFlexFec03AdvertisedKey = @"WebRTC-FlexFEC-03-Advertised";
+NSString * const kRTCFieldTrialFlexFec03Key = @"WebRTC-FlexFEC-03";
+NSString * const kRTCFieldTrialImprovedBitrateEstimateKey = @"WebRTC-ImprovedBitrateEstimate";
+NSString * const kRTCFieldTrialMedianSlopeFilterKey = @"WebRTC-BweMedianSlopeFilter";
+NSString * const kRTCFieldTrialTrendlineFilterKey = @"WebRTC-BweTrendlineFilter";
+NSString * const kRTCFieldTrialH264HighProfileKey = @"WebRTC-H264HighProfile";
+NSString * const kRTCFieldTrialEnabledValue = @"Enabled";
+
+static std::unique_ptr<char[]> gFieldTrialInitString;
+
+NSString *RTCFieldTrialMedianSlopeFilterValue(
+    size_t windowSize, double thresholdGain) {
+  NSString *format = @"Enabled-%zu,%lf";
+  return [NSString stringWithFormat:format, windowSize, thresholdGain];
+}
+
+NSString *RTCFieldTrialTrendlineFilterValue(
+    size_t windowSize, double smoothingCoeff, double thresholdGain) {
+  NSString *format = @"Enabled-%zu,%lf,%lf";
+  return [NSString stringWithFormat:format, windowSize, smoothingCoeff, thresholdGain];
+}
+
+void RTCInitFieldTrialDictionary(NSDictionary<NSString *, NSString *> *fieldTrials) {
+  if (!fieldTrials) {
+    RTCLogWarning(@"No fieldTrials provided.");
+    return;
+  }
+  // Assemble the keys and values into the field trial string.
+  // We don't perform any extra format checking. That should be done by the underlying WebRTC calls.
+  NSMutableString *fieldTrialInitString = [NSMutableString string];
+  for (NSString *key in fieldTrials) {
+    NSString *fieldTrialEntry = [NSString stringWithFormat:@"%@/%@/", key, fieldTrials[key]];
+    [fieldTrialInitString appendString:fieldTrialEntry];
+  }
+  size_t len = fieldTrialInitString.length + 1;
+  gFieldTrialInitString.reset(new char[len]);
+  if (![fieldTrialInitString getCString:gFieldTrialInitString.get()
+                              maxLength:len
+                               encoding:NSUTF8StringEncoding]) {
+    RTCLogError(@"Failed to convert field trial string.");
+    return;
+  }
+  webrtc::field_trial::InitFieldTrialsFromString(gFieldTrialInitString.get());
+}