Make FencedAlloctor fail on size = 0.

gpu/command_buffer/client/mapped_memory_unittest.cc

 // Copyright (c) 2012 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.
 
 #include "gpu/command_buffer/client/mapped_memory.h"
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "base/memory/scoped_ptr.h"
 #include "gpu/command_buffer/client/cmd_buffer_helper.h"
 #include "gpu/command_buffer/service/mocks.h"
@@ skipping 187 matching lines @@
   ASSERT_TRUE(mem5 != NULL);
   EXPECT_EQ(id3, id4);
   EXPECT_EQ(id4, id5);
   EXPECT_EQ(0u, offset4);
   EXPECT_EQ(kSize / 2u, offset5);
   manager_->Free(mem4);
   manager_->Free(mem2);
   manager_->Free(mem5);
 }
 
+TEST_F(MappedMemoryManagerTest, AllocZero) {
+  int32 id = -1;
+  unsigned int offset = 0xFFFFFFFFU;
+  void* mem = manager_->Alloc(0, &id, &offset);
+  ASSERT_TRUE(mem);
+  EXPECT_NE(-1, id);
+  EXPECT_EQ(0u, offset);
+  manager_->Free(mem);
+
+  id = -1;
+  offset = 0xFFFFFFFFU;
+  mem = manager_->Alloc(0, &id, &offset);
+
+  int32 token = helper_.get()->InsertToken();
+  manager_->FreePendingToken(mem, token);
+  EXPECT_GT(token, GetToken());
+  helper_->Finish();
+}
+
 TEST_F(MappedMemoryManagerTest, FreePendingToken) {
   const unsigned int kSize = 128;
   const unsigned int kAllocCount = (kBufferSize / kSize) * 2;
   CHECK(kAllocCount * kSize == kBufferSize * 2);
 
   // Allocate several buffers across multiple chunks.
   void *pointers[kAllocCount];
   for (unsigned int i = 0; i < kAllocCount; ++i) {
     int32 id = -1;
     unsigned int offset = 0xFFFFFFFFu;
@@ skipping 81 matching lines @@
   ASSERT_TRUE(mem3);
   EXPECT_NE(-1, id1);
   EXPECT_EQ(id1, id2);
   EXPECT_NE(id2, id3);
   EXPECT_EQ(0u, offset1);
   EXPECT_EQ(kSize, offset2);
   EXPECT_EQ(0u, offset3);
 }
 
 }  // namespace gpu