Add peer connection capability for Sharing Device.

Peer connection sharing capability is added to SharingSpecifics which
determines if a remote peer is capable of receiving an incoming request
to start a webrtc connection. This helps us to filter out M80+ devices
from older devices and reduce failure rates.

Bug: 1022288
Change-Id: If23506d07be0532a3e04a30fbd97d28fddd4d9c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903348Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Richard Knoll <knollr@chromium.org>
Commit-Queue: Himanshu Jaju <himanshujaju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713383}

chrome/browser/sharing/sharing_device_registration.cc

@@ -18,6 +18,7 @@
 #include "chrome/browser/sharing/sharing_sync_preference.h"
 #include "chrome/browser/sharing/sms/sms_flags.h"
 #include "chrome/browser/sharing/vapid_key_manager.h"
+#include "chrome/browser/sharing/webrtc/webrtc_flags.h"
 #include "chrome/common/pref_names.h"
 #include "components/gcm_driver/crypto/p256_key_util.h"
 #include "components/gcm_driver/instance_id/instance_id_driver.h"
@@ -204,6 +205,8 @@ SharingDeviceRegistration::GetEnabledFeatures() const {
     enabled_features.insert(SharingSpecificFields::SMS_FETCHER);
   if (IsRemoteCopySupported())
     enabled_features.insert(SharingSpecificFields::REMOTE_COPY);
+  if (IsPeerConnectionSupported())
+    enabled_features.insert(SharingSpecificFields::PEER_CONNECTION);
 
   return enabled_features;
 }
@@ -245,6 +248,10 @@ bool SharingDeviceRegistration::IsRemoteCopySupported() const {
   return false;
 }
 
+bool SharingDeviceRegistration::IsPeerConnectionSupported() const {
+  return base::FeatureList::IsEnabled(kSharingPeerConnectionReceiver);
+}
+
 void SharingDeviceRegistration::SetEnabledFeaturesForTesting(
     std::set<SharingSpecificFields::EnabledFeatures> enabled_features) {
   enabled_features_testing_value_ = std::move(enabled_features);

chrome/browser/sharing/sharing_device_registration.h

@@ -57,6 +57,9 @@ class SharingDeviceRegistration {
   // Returns if device can handle receiving of remote copy contents.
   virtual bool IsRemoteCopySupported() const;
 
+  // Returns if device can handle an incoming webrtc peer connection request.
+  bool IsPeerConnectionSupported() const;
+
   // For testing
   void SetEnabledFeaturesForTesting(
       std::set<sync_pb::SharingSpecificFields_EnabledFeatures>

components/sync/protocol/device_info_specifics.proto

@@ -97,6 +97,7 @@ message SharingSpecificFields {
     SHARED_CLIPBOARD = 2;
     SMS_FETCHER = 3;
     REMOTE_COPY = 4;
+    PEER_CONNECTION = 5;
   }
 
   // A list of enabled Sharing features.