Implement the getRequestDetails api in chrome side.

skia/ext/SkTraceMemoryDump_chrome.h

 // Copyright 2015 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.
 
 #ifndef SKIA_EXT_SK_TRACE_MEMORY_DUMP_CHROME_H_
 #define SKIA_EXT_SK_TRACE_MEMORY_DUMP_CHROME_H_
 
 #include <string>
 
+#include "base/basictypes.h"
 #include "base/macros.h"
+#include "base/trace_event/memory_dump_request_args.h"
 #include "third_party/skia/include/core/SkTraceMemoryDump.h"
 
 namespace base {
 namespace trace_event {
 class MemoryAllocatorDump;
 class ProcessMemoryDump;
 }
 }
 
 namespace skia {
 
 class SkTraceMemoryDump_Chrome : public SkTraceMemoryDump {
  public:
   // This should never outlive the OnMemoryDump call since the
   // ProcessMemoryDump is valid only in that timeframe. Optional
   // |dump_name_prefix| argument specifies the prefix appended to the dump
   // name skia provides. By default it is taken as empty string.
   SkTraceMemoryDump_Chrome(
+      base::trace_event::MemoryDumpLevelOfDetail level_of_detail,
       base::trace_event::ProcessMemoryDump* process_memory_dump);
 
   SkTraceMemoryDump_Chrome(
-      const char* dump_name_prefix,
+      const std::string& dump_name_prefix,
+      base::trace_event::MemoryDumpLevelOfDetail level_of_detail,
       base::trace_event::ProcessMemoryDump* process_memory_dump);
 
   ~SkTraceMemoryDump_Chrome() override;
 
   // SkTraceMemoryDump implementation:
   void dumpNumericValue(const char* dumpName,
                         const char* valueName,
                         const char* units,
                         uint64_t value) override;
   void setMemoryBacking(const char* dumpName,
                         const char* backingType,
                         const char* backingObjectId) override;
   void setDiscardableMemoryBacking(
       const char* dumpName,
       const SkDiscardableMemory& discardableMemoryObject) override;
+  LevelOfDetail getRequestedDetails() const override;
 
  protected:
   base::trace_event::ProcessMemoryDump* process_memory_dump() {
     return process_memory_dump_;
   }
 
  private:
+  // Helper to create allocator dumps.
+  base::trace_event::MemoryAllocatorDump* GetOrCreateAllocatorDump(
+      const char* dumpName);
+
   std::string dump_name_prefix_;
 
   base::trace_event::ProcessMemoryDump* process_memory_dump_;
 
-  // Helper to create allocator dumps.
-  base::trace_event::MemoryAllocatorDump* GetOrCreateAllocatorDump(
-      const char* dumpName);
+  // Stores the level of detail for the current dump.
+  LevelOfDetail request_level_;
 
   DISALLOW_COPY_AND_ASSIGN(SkTraceMemoryDump_Chrome);
 };
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_SK_TRACE_MEMORY_DUMP_CHROME_H_