content: Add SharedBitmap MemoryDumpProvider implementation.

content/common/host_shared_bitmap_manager.cc

Index: content/common/host_shared_bitmap_manager.cc
diff --git a/content/common/host_shared_bitmap_manager.cc b/content/common/host_shared_bitmap_manager.cc
index b95820c2f32c44867d7b3abba5f2b05d70f1d00d..3237a992fdbb67a1259b7548ac327474e9407dbc 100644
--- a/content/common/host_shared_bitmap_manager.cc
+++ b/content/common/host_shared_bitmap_manager.cc
@@ -6,6 +6,8 @@
 
 #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"
 
@@ -50,6 +52,8 @@ class HostSharedBitmap : public cc::SharedBitmap {
   HostSharedBitmapManager* manager_;
 };
 
+const char kMemoryAllocatorName[] = "sharedbitmap";
+
 }  // namespace
 
 base::LazyInstance<HostSharedBitmapManager> g_shared_memory_manager =
@@ -146,6 +150,26 @@ scoped_ptr<cc::SharedBitmap> HostSharedBitmapManager::GetSharedBitmapFromId(
       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,