[tracing] Introduce MemoryDumpArgs to enable light and heavy dumps

media/filters/vpx_video_decoder.cc

Index: media/filters/vpx_video_decoder.cc
diff --git a/media/filters/vpx_video_decoder.cc b/media/filters/vpx_video_decoder.cc
index ef60cfe013a9b34404d1fc7d6eb7b08de3f9e6e7..6c467db427ec9ca4ec309f335c74d0a25bd73108 100644
--- a/media/filters/vpx_video_decoder.cc
+++ b/media/filters/vpx_video_decoder.cc
@@ -102,7 +102,8 @@ class VpxVideoDecoder::MemoryPool
   // to this pool.
   base::Closure CreateFrameCallback(void* fb_priv_data);
 
-  bool OnMemoryDump(base::trace_event::ProcessMemoryDump* pmd) override;
+  bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
+                    base::trace_event::ProcessMemoryDump* pmd) override;
 
  private:
   friend class base::RefCountedThreadSafe<VpxVideoDecoder::MemoryPool>;
@@ -194,6 +195,7 @@ base::Closure VpxVideoDecoder::MemoryPool::CreateFrameCallback(
 }
 
 bool VpxVideoDecoder::MemoryPool::OnMemoryDump(
+    const base::trace_event::MemoryDumpArgs& args,
     base::trace_event::ProcessMemoryDump* pmd) {
   base::trace_event::MemoryAllocatorDump* memory_dump =
       pmd->CreateAllocatorDump("media/vpx/memory_pool");