Update metrics protos from google3

Bug: 976864
Change-Id: I3847686020daec31e1dd9ec840252fad62bc2c7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893356
Commit-Queue: Mike Wittman <wittman@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711338}

third_party/metrics_proto/README.chromium

 Name: Metrics Protos
 Short Name: metrics_proto
 URL: This is the canonical public repository
-Version: 274892279
-Date: 2019/10/15 UTC
+Version: 277734544
+Date: 2019/10/31 UTC
 License: BSD
 Security Critical: Yes
 

third_party/metrics_proto/call_stack_profile.proto

@@ -53,6 +53,9 @@ message CallStackProfile {
     // Index of the hash of the metadata name.
     optional int32 name_hash_index = 1;
 
+    // Optional user-specified key value. Absent if unspecified.
+    optional sint64 key = 3;
+
     // Value for the item. An absent value indicates the metadata has become
     // unset since the previous StackSample.
     optional sint64 value = 2;

third_party/metrics_proto/chrome_user_metrics_extension.proto

@@ -76,6 +76,7 @@ message ChromeUserMetricsExtension {
   repeated UserActionEventProto user_action_event = 4;
   repeated OmniboxEventProto omnibox_event = 5;
   repeated HistogramEventProto histogram_event = 6;
+
   repeated TranslateEventProto translate_event = 15;
   repeated PrinterEventProto printer_event = 16;
   repeated ChromeOSAppListLaunchEventProto chrome_os_app_list_launch_event = 20;

third_party/metrics_proto/system_profile.proto

@@ -991,8 +991,6 @@ message SystemProfileProto {
   // Specifically, whether the enable metrics/crash reporting checkbox that was
   // shown on first run was checked or unchecked by default.
   // This state is recorded on first run, and uploaded in every UMA log.
-  // Consequently this should only be defined for clients that were installed
-  // after the recording code was implemented.
   enum UmaDefaultState {
     // The enable checkbox was unchecked by default.
     OPT_IN = 0;
@@ -1000,6 +998,8 @@ message SystemProfileProto {
     OPT_OUT = 1;
     // Policy mandated that UMA be enabled, the user had no choice.
     POLICY_FORCED_ENABLED = 2;
+    // The client has no record of which consent flow was used.
+    OPT_UNKNOWN = 3;
   }
   optional UmaDefaultState uma_default_state = 22;