content: Add SharedBitmap MemoryDumpProvider implementation.

content/common/host_shared_bitmap_manager.cc

 // Copyright 2013 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 "content/common/host_shared_bitmap_manager.h"
 
 #include "base/lazy_instance.h"
 #include "base/memory/ref_counted.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/trace_event/process_memory_dump.h"
 #include "content/common/view_messages.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace content {
 
 class BitmapData : public base::RefCountedThreadSafe<BitmapData> {
  public:
   BitmapData(base::ProcessHandle process_handle,
              size_t buffer_size)
       : process_handle(process_handle),
@@ skipping 24 matching lines @@
   ~HostSharedBitmap() override {
     if (manager_)
       manager_->FreeSharedMemoryFromMap(id());
   }
 
  private:
   scoped_refptr<BitmapData> bitmap_data_;
   HostSharedBitmapManager* manager_;
 };
 
+const char kMemoryAllocatorName[] = "sharedbitmap";
+
 }  // namespace
 
 base::LazyInstance<HostSharedBitmapManager> g_shared_memory_manager =
     LAZY_INSTANCE_INITIALIZER;
 
 HostSharedBitmapManagerClient::HostSharedBitmapManagerClient(
     HostSharedBitmapManager* manager)
     : manager_(manager) {
 }
 
@@ skipping 76 matching lines @@
         new HostSharedBitmap(data->pixels.get(), data, id, nullptr));
   }
   if (!data->memory->memory()) {
     return scoped_ptr<cc::SharedBitmap>();
   }
 
   return make_scoped_ptr(new HostSharedBitmap(
       static_cast<uint8*>(data->memory->memory()), data, id, nullptr));
 }
 
+bool HostSharedBitmapManager::OnMemoryDump(
+    base::trace_event::ProcessMemoryDump* pmd) {
+  base::AutoLock lock(lock_);
+
+  for (const auto& bitmap : handle_map_) {
+    base::trace_event::MemoryAllocatorDump* dump = pmd->CreateAllocatorDump(
+        base::StringPrintf("%s/%s", kMemoryAllocatorName,
+                           base::HexEncode(bitmap.first.name,
+                                           sizeof(bitmap.first.name)).c_str()));
+    if (!dump)
+      return false;
+
+    dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameOuterSize,
+                    base::trace_event::MemoryAllocatorDump::kUnitsBytes,
+                    bitmap.second->buffer_size);
+  }
+
+  return true;
+}
+
 void HostSharedBitmapManager::ChildAllocatedSharedBitmap(
     size_t buffer_size,
     const base::SharedMemoryHandle& handle,
     base::ProcessHandle process_handle,
     const cc::SharedBitmapId& id) {
   base::AutoLock lock(lock_);
   if (handle_map_.find(id) != handle_map_.end())
     return;
   scoped_refptr<BitmapData> data(
       new BitmapData(process_handle, buffer_size));
@@ skipping 51 matching lines @@
   return handle_map_.size();
 }
 
 void HostSharedBitmapManager::FreeSharedMemoryFromMap(
     const cc::SharedBitmapId& id) {
   base::AutoLock lock(lock_);
   handle_map_.erase(id);
 }
 
 }  // namespace content