Filter blink::Profiler traces by invoker context

Passes the context associated with the profile invoker's ScriptState
into v8::CpuProfilingOptions for filtration, providing isolation of
traces to the invoker's realm.

Bug: 956688
Change-Id: Iafb46d1990841656b216588a67ef63e3198b0a14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1762249Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Nicolás Peña Moreno <npm@chromium.org>
Commit-Queue: Andrew Comminos <acomminos@fb.com>
Cr-Commit-Position: refs/heads/master@{#689137}

third_party/blink/renderer/core/timing/profiler_group.cc

@@ -80,11 +80,11 @@ Profiler* ProfilerGroup::CreateProfiler(ScriptState* script_state,
   DCHECK(cpu_profiler_);
 
   String profiler_id = NextProfilerId();
-  v8::CpuProfilingOptions options(v8::kLeafNodeLineNumbers,
-                                  init_options.hasMaxBufferSize()
-                                      ? init_options.maxBufferSize()
+  v8::CpuProfilingOptions options(
+      v8::kLeafNodeLineNumbers,
+      init_options.hasMaxBufferSize() ? init_options.maxBufferSize()
                                       : v8::CpuProfilingOptions::kNoSampleLimit,
-                                  static_cast<int>(sample_interval_us));
+      static_cast<int>(sample_interval_us), script_state->GetContext());
 
   cpu_profiler_->StartProfiling(V8String(isolate_, profiler_id), options);