[tracing] Add filtering mode in TraceLog

base/trace_event/heap_profiler_allocation_context_tracker_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 <stddef.h>
 
 #include <iterator>
 
 #include "base/memory/ref_counted.h"
 #include "base/pending_task.h"
 #include "base/trace_event/heap_profiler.h"
 #include "base/trace_event/heap_profiler_allocation_context.h"
 #include "base/trace_event/heap_profiler_allocation_context_tracker.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "base/trace_event/trace_event.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 namespace trace_event {
 
 // Define all strings once, because the pseudo stack requires pointer equality,
 // and string interning is unreliable.
 const char kThreadName[] = "TestThread";
 const char kCupcake[] = "Cupcake";
 const char kDonut[] = "Donut";
 const char kEclair[] = "Eclair";
 const char kFroyo[] = "Froyo";
 const char kGingerbread[] = "Gingerbread";
 
+const char kFilteringTraceConfig[] =
+    "{"
+    "  \"event_filters\": ["
+    "    {"
+    "      \"excluded_categories\": [],"
+    "      \"filter_args\": {},"
+    "      \"filter_predicate\": \"heap_profiler_predicate\","
+    "      \"included_categories\": [\"*\"]"
+    "    }"
+    "  ],"
+    "  \"included_categories\": [\"disabled-by-default-memory-infra\"]"
+    "}";
+
 // Asserts that the fixed-size array |expected_backtrace| matches the backtrace
 // in |AllocationContextTracker::GetContextSnapshot|.
 template <size_t N>
 void AssertBacktraceEquals(const StackFrame(&expected_backtrace)[N]) {
   AllocationContext ctx =
       AllocationContextTracker::GetInstanceForCurrentThread()
           ->GetContextSnapshot();
 
   auto* actual = std::begin(ctx.backtrace.frames);
   auto* actual_bottom = actual + ctx.backtrace.frame_count;
@@ skipping 21 matching lines @@
   ASSERT_EQ(t, ctx.backtrace.frames[0]);
 }
 
 class AllocationContextTrackerTest : public testing::Test {
  public:
   void SetUp() override {
     AllocationContextTracker::SetCaptureMode(
         AllocationContextTracker::CaptureMode::PSEUDO_STACK);
     // Enabling memory-infra category sets default memory dump config which
     // includes filters for capturing pseudo stack.
-    TraceConfig config(MemoryDumpManager::kTraceCategory, "");
+    TraceConfig config(kFilteringTraceConfig);
     TraceLog::GetInstance()->SetEnabled(config, TraceLog::RECORDING_MODE);
     AllocationContextTracker::SetCurrentThreadName(kThreadName);
   }
 
   void TearDown() override {
     AllocationContextTracker::SetCaptureMode(
         AllocationContextTracker::CaptureMode::DISABLED);
     TraceLog::GetInstance()->SetDisabled();
   }
 };
@@ skipping 219 matching lines @@
       AllocationContextTracker::GetInstanceForCurrentThread()
           ->GetContextSnapshot();
   const StringPiece kTracingOverhead("tracing_overhead");
   ASSERT_EQ(kTracingOverhead,
             static_cast<const char*>(ctx.backtrace.frames[0].value));
   ASSERT_EQ(1u, ctx.backtrace.frame_count);
 }
 
 }  // namespace trace_event
 }  // namespace base