Dump MappedMemoryManager memory via GLES2Implementation

gpu/command_buffer/client/mapped_memory.cc

Index: gpu/command_buffer/client/mapped_memory.cc
diff --git a/gpu/command_buffer/client/mapped_memory.cc b/gpu/command_buffer/client/mapped_memory.cc
index 0501d574e4b8671c09b4075c272d75bd425d598b..708e121f39c0c24a9593b0714bb14f3b28b5c210 100644
--- a/gpu/command_buffer/client/mapped_memory.cc
+++ b/gpu/command_buffer/client/mapped_memory.cc
@@ -47,19 +47,9 @@ MappedMemoryManager::MappedMemoryManager(CommandBufferHelper* helper,
       max_free_bytes_(unused_memory_reclaim_limit),
       max_allocated_bytes_(SharedMemoryLimits::kNoLimit),
       tracing_id_(g_next_mapped_memory_manager_tracing_id.GetNext()) {
-  // In certain cases, ThreadTaskRunnerHandle isn't set (Android Webview).
-  // Don't register a dump provider in these cases.
-  // TODO(ericrk): Get this working in Android Webview. crbug.com/517156
-  if (base::ThreadTaskRunnerHandle::IsSet()) {
-    base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
-        this, "gpu::MappedMemoryManager", base::ThreadTaskRunnerHandle::Get());
-  }
 }
 
 MappedMemoryManager::~MappedMemoryManager() {
-  base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(
-      this);
-
   CommandBuffer* cmd_buf = helper_->command_buffer();
   for (auto& chunk : chunks_) {
     cmd_buf->DestroyTransferBuffer(chunk->shm_id());