Make GrIODB keep pending IO refs on all resources it records into its cmd stream.

src/gpu/GrAllocator.h

Index: src/gpu/GrAllocator.h
diff --git a/src/gpu/GrAllocator.h b/src/gpu/GrAllocator.h
index fd45e8ad68b310bf92593b531cce7f4f7e4110db..861c3cbe2cffc8cf7ce5271729e85dd07cbd286b 100644
--- a/src/gpu/GrAllocator.h
+++ b/src/gpu/GrAllocator.h
@@ -224,8 +224,10 @@ private:
     typedef SkNoncopyable INHERITED;
 };
 
-template <typename T>
-class GrTAllocator : SkNoncopyable {
+template <typename T> class GrTAllocator;
+template <typename T> void* operator new(size_t, GrTAllocator<T>*);
+
+template <typename T> class GrTAllocator : SkNoncopyable {
 public:
     virtual ~GrTAllocator() { this->reset(); };
 
@@ -360,6 +362,8 @@ protected:
     }
 
 private:
+    friend void* operator new<T>(size_t, GrTAllocator*);
+
     GrAllocator fAllocator;
     typedef SkNoncopyable INHERITED;
 };
@@ -377,4 +381,18 @@ private:
     SkAlignedSTStorage<N, T> fStorage;
 };
 
+template <typename T> void* operator new(size_t size, GrTAllocator<T>* allocator) {
+    return allocator->fAllocator.push_back();
+}
+
+// Skia doesn't use C++ exceptions but it may be compiled with them enabled. Having an op delete
+// to match the op new silences warnings about missing op delete when a constructor throws an
+// exception.
+template <typename T> void operator delete(void*, GrTAllocator<T>*) {
+    SK_CRASH();
+}
+
+#define GrNEW_APPEND_TO_ALLOCATOR(allocator_ptr, type_name, args) \
+    new (allocator_ptr) type_name args
+
 #endif