Use movable types for CallStackProfile(s) to remove copying of data.

components/metrics/call_stack_profile_metrics_provider.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_METRICS_CALL_STACK_PROFILE_METRICS_PROVIDER_H_
 #define COMPONENTS_METRICS_CALL_STACK_PROFILE_METRICS_PROVIDER_H_
 
 #include <vector>
 
 #include "base/macros.h"
@@ skipping 13 matching lines @@
 
   // Get a callback for use with StackSamplingProfiler that provides completed
   // profiles to this object. The callback should be immediately passed to the
   // StackSamplingProfiler, and should not be reused between
   // StackSamplingProfilers. This function may be called on any thread.
   static base::StackSamplingProfiler::CompletedCallback GetProfilerCallback(
       const CallStackProfileParams& params);
 
   // Provides completed stack profiles to the metrics provider. Intended for use
   // when receiving profiles over IPC. In-process StackSamplingProfiler users
-  // should use GetProfilerCallback() instead.
+  // should use GetProfilerCallback() instead. |profiles| is not const& because
+  // it must be passed with std::move.
   static void ReceiveCompletedProfiles(
       const CallStackProfileParams& params,
       base::TimeTicks start_timestamp,
-      const base::StackSamplingProfiler::CallStackProfiles& profiles);
+      base::StackSamplingProfiler::CallStackProfiles profiles);
 
   // MetricsProvider:
   void OnRecordingEnabled() override;
   void OnRecordingDisabled() override;
   void ProvideGeneralMetrics(ChromeUserMetricsExtension* uma_proto) override;
 
  protected:
   // Finch field trial and group for reporting profiles. Provided here for test
   // use.
   static const char kFieldTrialName[];
   static const char kReportProfilesGroupName[];
 
   // Reset the static state to the defaults after startup.
   static void ResetStaticStateForTesting();
 
  private:
   // Returns true if reporting of profiles is enabled according to the
   // controlling Finch field trial.
   static bool IsReportingEnabledByFieldTrial();
 
   DISALLOW_COPY_AND_ASSIGN(CallStackProfileMetricsProvider);
 };
 
 }  // namespace metrics
 
 #endif  // COMPONENTS_METRICS_CALL_STACK_PROFILE_METRICS_PROVIDER_H_