[Memory-UMA] Implement basic working prototype.

chrome/browser/metrics/process_memory_metrics_emitter.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/metrics/process_memory_metrics_emitter.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "base/trace_event/memory_dump_request_args.h"
 #include "content/public/common/service_manager_connection.h"
 #include "content/public/common/service_names.mojom.h"
 #include "services/service_manager/public/cpp/connector.h"
 
 using ProcessMemoryDumpPtr =
     memory_instrumentation::mojom::ProcessMemoryDumpPtr;
 
 namespace {
 
 void EmitBrowserMemoryMetrics(const ProcessMemoryDumpPtr& pmd) {
   UMA_HISTOGRAM_MEMORY_LARGE_MB("Memory.Experimental.Browser2.Resident",
-                                pmd->os_dump.resident_set_kb * 1024);
+                                pmd->os_dump.resident_set_kb / 1024);
   UMA_HISTOGRAM_MEMORY_LARGE_MB("Memory.Experimental.Browser2.Malloc",
-                                pmd->chrome_dump.malloc_total_kb * 1024);
-
+                                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);
+                                pmd->os_dump.resident_set_kb / 1024);
   UMA_HISTOGRAM_MEMORY_LARGE_MB("Memory.Experimental.Renderer2.Malloc",
-                                pmd->chrome_dump.malloc_total_kb * 1024);
+                                pmd->chrome_dump.malloc_total_kb / 1024);
   UMA_HISTOGRAM_MEMORY_LARGE_MB(
       "Memory.Experimental.Renderer2.PartitionAlloc",
-      pmd->chrome_dump.partition_alloc_total_kb * 1024);
+      pmd->chrome_dump.partition_alloc_total_kb / 1024);
   UMA_HISTOGRAM_MEMORY_LARGE_MB("Memory.Experimental.Renderer2.BlinkGC",
-                                pmd->chrome_dump.blink_gc_total_kb * 1024);
+                                pmd->chrome_dump.blink_gc_total_kb / 1024);
   UMA_HISTOGRAM_MEMORY_LARGE_MB("Memory.Experimental.Renderer2.V8",
-                                pmd->chrome_dump.v8_total_kb * 1024);
+                                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);
+                                pmd->os_dump.resident_set_kb / 1024);
   UMA_HISTOGRAM_MEMORY_LARGE_MB("Memory.Experimental.Gpu2.Malloc",
-                                pmd->chrome_dump.malloc_total_kb * 1024);
+                                pmd->chrome_dump.malloc_total_kb / 1024);
 
   // TODO(erikchen): Emit private memory footprint. https://crbug.com/721434.
 }
 
 }  // namespace
 
 ProcessMemoryMetricsEmitter::ProcessMemoryMetricsEmitter() {}
 
 void ProcessMemoryMetricsEmitter::FetchAndEmitProcessMemoryMetrics() {
   service_manager::Connector* connector =
@@ skipping 33 matching lines @@
       case memory_instrumentation::mojom::ProcessType::GPU:
         EmitGpuMemoryMetrics(pmd);
         break;
       case memory_instrumentation::mojom::ProcessType::UTILITY:
       case memory_instrumentation::mojom::ProcessType::PLUGIN:
       case memory_instrumentation::mojom::ProcessType::OTHER:
         break;
     }
   }
 }