StackSamplingProfiler: collect partial bursts if the profiler is stopped early

base/profiler/stack_sampling_profiler_unittest.cc

 // 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.
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_vector.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
 #include "base/profiler/stack_sampling_profiler.h"
@@ skipping 328 matching lines @@
   params.bursts = 2;
   params.samples_per_burst = 1;
 
   std::vector<CallStackProfile> profiles;
   CaptureProfiles(params, TimeDelta::FromMilliseconds(50), &profiles);
 
   ASSERT_EQ(1u, profiles.size());
   EXPECT_EQ(1u, profiles[0].samples.size());
 }
 
-// Checks that only completed call stack profiles are captured.
+// Checks that incomplete call stack profiles are captured.
 #if defined(STACK_SAMPLING_PROFILER_SUPPORTED)
 #define MAYBE_StopDuringInterSampleInterval StopDuringInterSampleInterval
 #else
 #define MAYBE_StopDuringInterSampleInterval \
   DISABLED_StopDuringInterSampleInterval
 #endif
 TEST(StackSamplingProfilerTest, MAYBE_StopDuringInterSampleInterval) {
   SamplingParams params;
   params.sampling_interval = TimeDelta::FromSeconds(60);
   params.samples_per_burst = 2;
 
   std::vector<CallStackProfile> profiles;
   CaptureProfiles(params, TimeDelta::FromMilliseconds(50), &profiles);
 
-  EXPECT_TRUE(profiles.empty());
+  ASSERT_EQ(1u, profiles.size());
+  EXPECT_EQ(1u, profiles[0].samples.size());
 }
 
 // Checks that we can destroy the profiler while profiling.
 #if defined(STACK_SAMPLING_PROFILER_SUPPORTED)
 #define MAYBE_DestroyProfilerWhileProfiling DestroyProfilerWhileProfiling
 #else
 #define MAYBE_DestroyProfilerWhileProfiling \
   DISABLED_DestroyProfilerWhileProfiling
 #endif
 TEST(StackSamplingProfilerTest, MAYBE_DestroyProfilerWhileProfiling) {
@@ skipping 75 matching lines @@
         sampling_completed[1]->TimedWait(TimeDelta::FromMilliseconds(25)));
 
     // Start the second profiler again and it should run.
     profiler[1]->Start();
     sampling_completed[1]->Wait();
     EXPECT_EQ(1u, profiles[1].size());
   });
 }
 
 }  // namespace base