Emit UMAs for private memory footprint.

chrome/browser/metrics/process_memory_metrics_emitter.cc

Index: chrome/browser/metrics/process_memory_metrics_emitter.cc
diff --git a/chrome/browser/metrics/process_memory_metrics_emitter.cc b/chrome/browser/metrics/process_memory_metrics_emitter.cc
index 2b53ff17370fc73ac7d37f4ca6b3fef97dd2e0a6..4149ef30be84e99224e71ecc1d936ac83e9ff6da 100644
--- a/chrome/browser/metrics/process_memory_metrics_emitter.cc
+++ b/chrome/browser/metrics/process_memory_metrics_emitter.cc
@@ -18,15 +18,19 @@ namespace {
 void EmitBrowserMemoryMetrics(const ProcessMemoryDumpPtr& pmd) {
   UMA_HISTOGRAM_MEMORY_LARGE_MB("Memory.Experimental.Browser2.Resident",
                                 pmd->os_dump.resident_set_kb * 1024);
+  UMA_HISTOGRAM_MEMORY_LARGE_MB(
+      "Memory.Experimental.Browser2.PrivateMemoryFootprint",
+      pmd->private_footprint);
   UMA_HISTOGRAM_MEMORY_LARGE_MB("Memory.Experimental.Browser2.Malloc",
                                 pmd->chrome_dump.malloc_total_kb * 1024);
-
-  // TODO(erikchen): Emit private memory footprint. https://crbug.com/721434.
 }
 
 void EmitRendererMemoryMetrics(const ProcessMemoryDumpPtr& pmd) {
   UMA_HISTOGRAM_MEMORY_LARGE_MB("Memory.Experimental.Renderer2.Resident",
                                 pmd->os_dump.resident_set_kb * 1024);
+  UMA_HISTOGRAM_MEMORY_LARGE_MB(
+      "Memory.Experimental.Renderer2.PrivateMemoryFootprint",
+      pmd->private_footprint);
   UMA_HISTOGRAM_MEMORY_LARGE_MB("Memory.Experimental.Renderer2.Malloc",
                                 pmd->chrome_dump.malloc_total_kb * 1024);
   UMA_HISTOGRAM_MEMORY_LARGE_MB(
@@ -36,17 +40,16 @@ void EmitRendererMemoryMetrics(const ProcessMemoryDumpPtr& pmd) {
                                 pmd->chrome_dump.blink_gc_total_kb * 1024);
   UMA_HISTOGRAM_MEMORY_LARGE_MB("Memory.Experimental.Renderer2.V8",
                                 pmd->chrome_dump.v8_total_kb * 1024);
-
-  // TODO(erikchen): Emit private memory footprint. https://crbug.com/721434.
 }
 
 void EmitGpuMemoryMetrics(const ProcessMemoryDumpPtr& pmd) {
   UMA_HISTOGRAM_MEMORY_LARGE_MB("Memory.Experimental.Gpu2.Resident",
                                 pmd->os_dump.resident_set_kb * 1024);
+  UMA_HISTOGRAM_MEMORY_LARGE_MB(
+      "Memory.Experimental.Gpu2.PrivateMemoryFootprint",
+      pmd->private_footprint);
   UMA_HISTOGRAM_MEMORY_LARGE_MB("Memory.Experimental.Gpu2.Malloc",
                                 pmd->chrome_dump.malloc_total_kb * 1024);
-
-  // TODO(erikchen): Emit private memory footprint. https://crbug.com/721434.
 }
 
 }  // namespace