Refactor CallStackProfile::Params into base/ for use over IPC.

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/memory/ref_counted.h"
+#include "base/metrics/call_stack_profile_params.h"
 #include "base/profiler/stack_sampling_profiler.h"
 #include "components/metrics/metrics_provider.h"
 
 namespace metrics {
 class ChromeUserMetricsExtension;
 
 // Performs metrics logging for the stack sampling profiler.
 class CallStackProfileMetricsProvider : public MetricsProvider {
  public:
   // The event that triggered the profile collection.
   enum Trigger {
     UNKNOWN,
     PROCESS_STARTUP,
     JANKY_TASK,
     THREAD_HUNG
   };
 
-  // Parameters to pass back to the metrics provider.
-  struct Params {
-    explicit Params(Trigger trigger);
-    Params(Trigger trigger, bool preserve_sample_ordering);
-
-    // The triggering event.
-    Trigger trigger;
-
-    // True if sample ordering is important and should be preserved when the
-    // associated profiles are compressed. This should only be set to true if
-    // the intended use of the requires that the sequence of call stacks within
-    // a particular profile be preserved. The default value of false provides
-    // better compression of the encoded profile and is sufficient for the
-    // typical use case of recording profiles for stack frequency analysis in
-    // aggregate.
-    bool preserve_sample_ordering;
-  };
-
   CallStackProfileMetricsProvider();
   ~CallStackProfileMetricsProvider() override;
 
   // 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 Params& params);
+      const base::CallStackProfileParams& params);
 
   // 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_