Add cc::SharedBitmap::shared_memory_handle()

cc/test/test_shared_bitmap_manager.cc

Index: cc/test/test_shared_bitmap_manager.cc
diff --git a/cc/test/test_shared_bitmap_manager.cc b/cc/test/test_shared_bitmap_manager.cc
index 604f669af5bbb643ef9aa3a94cf17182e62eed36..ca4b50f03d490ae227fd326aba1e735a97aa4f2e 100644
--- a/cc/test/test_shared_bitmap_manager.cc
+++ b/cc/test/test_shared_bitmap_manager.cc
@@ -12,6 +12,7 @@
 namespace cc {
 
 namespace {
+
 class OwnedSharedBitmap : public SharedBitmap {
  public:
   OwnedSharedBitmap(std::unique_ptr<base::SharedMemory> shared_memory,
@@ -21,10 +22,26 @@ class OwnedSharedBitmap : public SharedBitmap {
 
   ~OwnedSharedBitmap() override {}
 
+  // SharedBitmap:
+  base::SharedMemoryHandle GetSharedMemoryHandle() const override {
+    return shared_memory_->handle();
+  }
+
  private:
   std::unique_ptr<base::SharedMemory> shared_memory_;
 };
 
+class UnownedSharedBitmap : public SharedBitmap {
+ public:
+  UnownedSharedBitmap(uint8_t* pixels, const SharedBitmapId& id)
+      : SharedBitmap(pixels, id) {}
+
+  // SharedBitmap:
+  base::SharedMemoryHandle GetSharedMemoryHandle() const override {
+    return base::SharedMemoryHandle();
+  }
+};
+
 }  // namespace
 
 TestSharedBitmapManager::TestSharedBitmapManager() {}
@@ -48,7 +65,7 @@ std::unique_ptr<SharedBitmap> TestSharedBitmapManager::GetSharedBitmapFromId(
   if (bitmap_map_.find(id) == bitmap_map_.end())
     return nullptr;
   uint8_t* pixels = static_cast<uint8_t*>(bitmap_map_[id]->memory());
-  return base::MakeUnique<SharedBitmap>(pixels, id);
+  return base::MakeUnique<UnownedSharedBitmap>(pixels, id);
 }
 
 }  // namespace cc