Rename content_capture category name.

Bug: 1006418
Change-Id: I9485ecf2586ef1527bc3dbc664ce6603cfb95570
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1838687Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705989}

base/trace_event/builtin_categories.h

@@ -15,6 +15,9 @@
 // your code and you get a static assert, this is the right place to register
 // the name. If the name is going to be used only for testing, please add it to
 // |kIgnoredCategoriesForTesting| instead.
+//
+// Prefer to use '_' to separate word of category name, like content_capture.
+//
 // Parameter |X| must be a *macro* that takes a single |name| string argument,
 // denoting a category name.
 #define INTERNAL_TRACE_LIST_BUILTIN_CATEGORIES(X)                        \
@@ -52,7 +55,7 @@
   X("cma")                                                               \
   X("compositor")                                                        \
   X("content")                                                           \
-  X("content-capture")                                                   \
+  X("content_capture")                                                   \
   X("devtools")                                                          \
   X("devtools.timeline")                                                 \
   X("devtools.timeline.async")                                           \

third_party/blink/renderer/core/content_capture/content_capture_task.cc

@@ -196,7 +196,7 @@ bool ContentCaptureTask::RunInternal() {
 }
 
 void ContentCaptureTask::Run(TimerBase*) {
-  TRACE_EVENT0("content-capture", "RunTask");
+  TRACE_EVENT0("content_capture", "RunTask");
   is_scheduled_ = false;
   if (!RunInternal()) {
     ScheduleInternal(ScheduleReason::kRetryTask);
@@ -229,7 +229,7 @@ void ContentCaptureTask::ScheduleInternal(ScheduleReason reason) {
 
   delay_task_->StartOneShot(delay, FROM_HERE);
   is_scheduled_ = true;
-  TRACE_EVENT_INSTANT1("content-capture", "ScheduleTask",
+  TRACE_EVENT_INSTANT1("content_capture", "ScheduleTask",
                        TRACE_EVENT_SCOPE_THREAD, "reason", reason);
 }