Make stack sampling profiler sample beyond startup.

chrome/common/stack_sampling_configuration.h

Index: chrome/common/stack_sampling_configuration.h
diff --git a/chrome/common/stack_sampling_configuration.h b/chrome/common/stack_sampling_configuration.h
index 452c4eee9e62c0987d62c74dccabc1793135f31f..cd1f170bd541020879c6451051edfe6f97b74805 100644
--- a/chrome/common/stack_sampling_configuration.h
+++ b/chrome/common/stack_sampling_configuration.h
@@ -10,6 +10,7 @@
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/profiler/stack_sampling_profiler.h"
+#include "components/metrics/call_stack_profile_metrics_provider.h"
 
 namespace base {
 class CommandLine;
@@ -25,7 +26,11 @@ class StackSamplingConfiguration {
 
   // Get the stack sampling params to use for this process.
   base::StackSamplingProfiler::SamplingParams
-      GetSamplingParamsForCurrentProcess() const;
+  GetSamplingParamsForCurrentProcess() const;
+
+  // Returns the profiler callback to use for this process.
+  base::StackSamplingProfiler::CompletedCallback
+  GetProfilerCallbackForCurrentProcess();
 
   // Returns true if the profiler should be started for the current process.
   bool IsProfilerEnabledForCurrentProcess() const;
@@ -81,6 +86,10 @@ class StackSamplingConfiguration {
   // PROFILE_FROM_COMMAND_LINE.
   const ProfileConfiguration configuration_;
 
+  // The current profiling params. Not const since these may be changed when
+  // transitioning from start-up profiling to periodic profiling.
+  metrics::CallStackProfileParams profile_params_;
+
   DISALLOW_COPY_AND_ASSIGN(StackSamplingConfiguration);
 };