Adding total available size of heap in v8 isolate memory dump provider.

gin/v8_isolate_memory_dump_provider.cc

Index: gin/v8_isolate_memory_dump_provider.cc
diff --git a/gin/v8_isolate_memory_dump_provider.cc b/gin/v8_isolate_memory_dump_provider.cc
index 4530879a7969233c103baa1acad96a0b749d7720..fd58efdb15c98e1a86cb4337d23de914a162bead 100644
--- a/gin/v8_isolate_memory_dump_provider.cc
+++ b/gin/v8_isolate_memory_dump_provider.cc
@@ -53,6 +53,7 @@ void V8IsolateMemoryDumpProvider::DumpMemoryStatistics(
 
   size_t known_spaces_used_size = 0;
   size_t known_spaces_size = 0;
+  size_t known_spaces_available_size = 0;
   size_t number_of_spaces = isolate_holder_->isolate()->NumberOfHeapSpaces();
   for (size_t space = 0; space < number_of_spaces; space++) {
     v8::HeapSpaceStatistics space_statistics;
@@ -60,9 +61,11 @@ void V8IsolateMemoryDumpProvider::DumpMemoryStatistics(
                                                        space);
     const size_t space_size = space_statistics.space_size();
     const size_t space_used_size = space_statistics.space_used_size();
+    size_t space_available_size = space_statistics.space_available_size();
 
     known_spaces_size += space_size;
     known_spaces_used_size += space_used_size;
+    known_spaces_available_size += space_available_size;
 
     std::string allocator_name =
         base::StringPrintf("%s/%s_%p/%s/%s", kRootDumpName, kIsolateDumpName,
@@ -74,14 +77,12 @@ void V8IsolateMemoryDumpProvider::DumpMemoryStatistics(
         base::trace_event::MemoryAllocatorDump::kNameOuterSize,
         base::trace_event::MemoryAllocatorDump::kUnitsBytes, space_size);
 
-    // TODO(ssid): Fix crbug.com/481504 to get the objects count of live objects
-    // after the last GC.
     space_dump->AddScalar(
         base::trace_event::MemoryAllocatorDump::kNameInnerSize,
         base::trace_event::MemoryAllocatorDump::kUnitsBytes, space_used_size);
     space_dump->AddScalar(kAvailableSizeAttribute,
                           base::trace_event::MemoryAllocatorDump::kUnitsBytes,
-                          space_statistics.space_available_size());
+                          space_available_size);
   }
   // Compute the rest of the memory, not accounted by the spaces above.
   std::string allocator_name = base::StringPrintf(
@@ -102,7 +103,8 @@ void V8IsolateMemoryDumpProvider::DumpMemoryStatistics(
   // heap.
   other_spaces_dump->AddScalar(
       kAvailableSizeAttribute,
-      base::trace_event::MemoryAllocatorDump::kUnitsBytes, 0);
+      base::trace_event::MemoryAllocatorDump::kUnitsBytes,
+      heap_statistics.total_available_size() - known_spaces_available_size);
 }
 
 }  // namespace gin