Adding V8 code large object space metrics.

Privacy review doc: https://goo.gl/X5eYHh

Change-Id: Ic99b316b1ab2fe665670f0131f8255b9ac4b0395
Reviewed-on: https://chromium-review.googlesource.com/c/1345434Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610094}

chrome/browser/metrics/process_memory_metrics_emitter.cc

@@ -174,6 +174,15 @@ const Metric kAllocatorDumpNamesForMetrics[] = {
     {"v8/main/heap", "V8.Main.Heap.AllocatedObjects", kLargeMetric,
      kAllocatedObjectsSize, EmitTo::kUkmAndUmaAsSize,
      &Memory_Experimental::SetV8_Main_Heap_AllocatedObjects},
+    {"v8/main/heap/code_large_object_space",
+     "V8.Main.Heap.CodeLargeObjectSpace", kLargeMetric, kEffectiveSize,
+     EmitTo::kUkmAndUmaAsSize,
+     &Memory_Experimental::SetV8_Main_Heap_CodeLargeObjectSpace},
+    {"v8/main/heap/code_large_object_space",
+     "V8.Main.Heap.CodeLargeObjectSpace.AllocatedObjects", kLargeMetric,
+     kAllocatedObjectsSize, EmitTo::kUkmAndUmaAsSize,
+     &Memory_Experimental::
+         SetV8_Main_Heap_CodeLargeObjectSpace_AllocatedObjects},
     {"v8/main/heap/code_space", "V8.Main.Heap.CodeSpace", kLargeMetric,
      kEffectiveSize, EmitTo::kUkmAndUmaAsSize,
      &Memory_Experimental::SetV8_Main_Heap_CodeSpace},

chrome/browser/metrics/process_memory_metrics_emitter_unittest.cc

@@ -196,6 +196,15 @@ void PopulateRendererMetrics(GlobalMemoryDumpPtr& global_dump,
       pmd, "v8/main/heap", "allocated_objects_size",
       metrics_mb_or_count["V8.Main.Heap.AllocatedObjects"] * 1024 * 1024);
 
+  SetAllocatorDumpMetric(
+      pmd, "v8/main/heap/code_large_object_space", "effective_size",
+      metrics_mb_or_count["V8.Main.Heap.CodeLargeObjectSpace"] * 1024 * 1024);
+  SetAllocatorDumpMetric(
+      pmd, "v8/main/heap/code_large_object_space", "allocated_objects_size",
+      metrics_mb_or_count
+              ["V8.Main.Heap.CodeLargeObjectSpace.AllocatedObjects"] *
+          1024 * 1024);
+
   SetAllocatorDumpMetric(
       pmd, "v8/main/heap/code_space", "effective_size",
       metrics_mb_or_count["V8.Main.Heap.CodeSpace"] * 1024 * 1024);

tools/metrics/ukm/ukm.xml

@@ -2716,6 +2716,18 @@ be describing additional metrics about the same event.
       Measure of memory consumed by live objects in the main heap of V8.
     </summary>
   </metric>
+  <metric name="V8.Main.Heap.CodeLargeObjectSpace">
+    <summary>
+      Measure of memory consumed by the code large object space of the main heap
+      of V8.
+    </summary>
+  </metric>
+  <metric name="V8.Main.Heap.CodeLargeObjectSpace.AllocatedObjects">
+    <summary>
+      Measure of memory consumed by live objects in the code large object space
+      of the main heap of V8.
+    </summary>
+  </metric>
   <metric name="V8.Main.Heap.CodeSpace">
     <summary>
       Measure of memory consumed by the code space of the main heap of V8.