Stack sampling profiler: move configuration to chrome/common

chrome/common/stack_sampling_configuration.h

Index: chrome/common/stack_sampling_configuration.h
diff --git a/chrome/browser/stack_sampling_configuration.h b/chrome/common/stack_sampling_configuration.h
similarity index 70%
rename from chrome/browser/stack_sampling_configuration.h
rename to chrome/common/stack_sampling_configuration.h
index 9a52b037b7e4769c7d4980a9603465f009b1992f..1ff64a583c93ad1fef45d4abf961622fc10de217 100644
--- a/chrome/browser/stack_sampling_configuration.h
+++ b/chrome/common/stack_sampling_configuration.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_STACK_SAMPLING_CONFIGURATION_H_
-#define CHROME_BROWSER_STACK_SAMPLING_CONFIGURATION_H_
+#ifndef CHROME_COMMON_STACK_SAMPLING_CONFIGURATION_H_
+#define CHROME_COMMON_STACK_SAMPLING_CONFIGURATION_H_
 
 #include "base/macros.h"
 #include "base/profiler/stack_sampling_profiler.h"
@@ -13,6 +13,12 @@
 // friended by ChromeMetricsServiceAccessor.
 class StackSamplingConfiguration {
  public:
+  // This callback indirection is required to avoid a DEPS on
+  // chrome/browser/metrics.
+  using RegisterSyntheticFieldTrialFunction = base::Callback<bool(
+      const std::string& trial_name,
+      const std::string& group_name)>;
+
   StackSamplingConfiguration();
 
   // Get the stack sampling params to use for this session.
@@ -22,7 +28,8 @@ class StackSamplingConfiguration {
   bool IsProfilerEnabled() const;
 
   // Register the chosen configuration as a synthetic field trial.
-  void RegisterSyntheticFieldTrial() const;
+  void RegisterSyntheticFieldTrial(
+      const RegisterSyntheticFieldTrialFunction& register_field_trial) const;
 
  private:
   enum ProfileConfiguration {
@@ -41,4 +48,4 @@ class StackSamplingConfiguration {
   DISALLOW_COPY_AND_ASSIGN(StackSamplingConfiguration);
 };
 
-#endif  // CHROME_BROWSER_STACK_SAMPLING_CONFIGURATION_H_
+#endif  // CHROME_COMMON_STACK_SAMPLING_CONFIGURATION_H_