[tracing] Allow enabling heap profiling from chrome://flags

chrome/browser/flag_descriptions.cc

Index: chrome/browser/flag_descriptions.cc
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index 8e3ab41bb5ce47a7bae6a344b688bf7eca178b85..fb54c3bc46437b3f62f8f193d988353c9d2fd1aa 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -3058,4 +3058,14 @@ const char kOmniboxDisplayTitleForCurrentUrlDescription[] =
     "the current page is provided as the first suggestion without a title. "
     "Enabling this flag causes the title to be displayed.";
 
+const char kEnableHeapProfilingName[] = "Heap profiling";
+
+const char kEnableHeapProfilingDescription[] = "Enables heap profiling.";
+
+const char kEnableHeapProfilingModePseudo[] = "Enabled (pseudo mode)";
+
+const char kEnableHeapProfilingModeNative[] = "Enabled (native mode)";
+
+const char kEnableHeapProfilingTaskProfiler[] = "Enabled (task mode)";
+
 }  // namespace flag_descriptions