arc: enable Android tracing in verified-boot mode

chrome/browser/chromeos/arc/tracing/arc_tracing_bridge.cc

 // Copyright 2017 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 "chrome/browser/chromeos/arc/tracing/arc_tracing_bridge.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/arc/arc_bridge_service.h"
 #include "components/arc/arc_service_manager.h"
 #include "content/public/browser/browser_thread.h"
+#include "mojo/public/cpp/system/platform_handle.h"
 
 namespace arc {
 
 namespace {
 
 // The prefix of the categories to be shown on the trace selection UI.
 // The space at the end of the string is intentional as the separator between
 // the prefix and the real categories.
 constexpr char kCategoryPrefix[] = TRACE_DISABLED_BY_DEFAULT("android ");
 
@@ skipping 29 matching lines @@
 
 void ArcTracingBridge::OnCategoriesReady(
     const std::vector<std::string>& categories) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   // There is no API in TraceLog to remove a category from the UI. As an
   // alternative, the old category that is no longer in |categories_| will be
   // ignored when calling |StartTracing|.
   categories_.clear();
   for (const auto& category : categories) {
-    categories_.push_back({category, kCategoryPrefix + category});
+    categories_.emplace_back(Category{category, kCategoryPrefix + category});
     // Show the category name in the selection UI.
     base::trace_event::TraceLog::GetCategoryGroupEnabled(
         categories_.back().full_name.c_str());
   }
 }
 
 void ArcTracingBridge::StartTracing(
     const base::trace_event::TraceConfig& trace_config,
+    base::ScopedFD write_fd,
     const StartTracingCallback& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   mojom::TracingInstance* tracing_instance = ARC_GET_INSTANCE_FOR_METHOD(
       arc_bridge_service()->tracing(), StartTracing);
   if (!tracing_instance) {
     // Use PostTask as the convention of TracingAgent. The caller expects
     // callback to be called after this function returns.
     base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
                                                   base::Bind(callback, false));
     return;
   }
 
   std::vector<std::string> selected_categories;
   for (const auto& category : categories_) {
     if (trace_config.IsCategoryGroupEnabled(category.full_name))
       selected_categories.push_back(category.name);
   }
 
-  tracing_instance->StartTracing(selected_categories, callback);
+  tracing_instance->StartTracing(selected_categories,
+                                 mojo::WrapPlatformFile(write_fd.release()),
+                                 callback);
 }
 
 void ArcTracingBridge::StopTracing(const StopTracingCallback& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   mojom::TracingInstance* tracing_instance =
       ARC_GET_INSTANCE_FOR_METHOD(arc_bridge_service()->tracing(), StopTracing);
   if (!tracing_instance) {
     base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
                                                   base::Bind(callback, false));
     return;
   }
   tracing_instance->StopTracing(callback);
 }
 
 }  // namespace arc