Sync metrics_proto.

Change-Id: Ie940ec04243b1a4382cd557c8d9b462d6a2fab0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1628250Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Alexei Filippov <alph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663008}

third_party/metrics_proto/README.chromium

 Name: Metrics Protos
 Short Name: metrics_proto
 URL: This is the canonical public repository
-Version: 249161107
-Date: 2019/05/21 UTC
+Version: 249743511
+Date: 2019/05/24 UTC
 License: BSD
 Security Critical: Yes
 

third_party/metrics_proto/call_stack_profile.proto

@@ -113,9 +113,17 @@ message CallStackProfile {
     // Weight of the sample. When omitted the sample is presumed to have
     // a weight of 1.
     // Not currently used for CPU profiles.
-    // For heap profiles it represents the number of bytes attributed to the
-    // sample.
+    // For heap profiles it represents the total number of bytes associated with
+    // the StackSample record.
     optional int64 weight = 6;
+
+    // Number of events associated with the sample. When omitted the default
+    // value of 1 should be used.
+    // Not currently used for CPU profiles.
+    // For heap profiles it represents the number of allocations associated with
+    // the StackSample record. The following relation holds:
+    //   allocation_size * count == weight.
+    optional int64 count = 7 [default = 1];
   }
 
   // The previous sample encoding. Deprecated 2018/08/04 in favor of

third_party/metrics_proto/cast_logs.proto

@@ -9,8 +9,7 @@ option optimize_for = LITE_RUNTIME;
 option java_outer_classname = "CastLogsProtos";
 option java_package = "org.chromium.components.metrics";
 
-package metrics;  // Cast-enabled device specific log data included in
-                  // ChromeUserMetricsExtension.
+package metrics;  // Cast-enabled device specific log data included in ChromeUserMetricsExtension.
 
 // Next tag: 7
 message CastLogsProto {

third_party/metrics_proto/chrome_os_app_list_launch_event.proto

@@ -8,8 +8,6 @@ option optimize_for = LITE_RUNTIME;
 
 package metrics;
 
-import "system_profile.proto";
-
 // Provides information about the launch of an item (such as an app or a file)
 // from the ChromeOS launcher. One event is recorded for every launch
 // originating from any launcher UI component, and this is the only circumstance