Fixes for re-enabling more MSVC level 4 warnings: gpu/ edition

gpu/command_buffer/common/id_allocator_test.cc

Index: gpu/command_buffer/common/id_allocator_test.cc
diff --git a/gpu/command_buffer/common/id_allocator_test.cc b/gpu/command_buffer/common/id_allocator_test.cc
index 624f959b28725cd0866ffc953f7c4ff6d55cfb85..5d32e40b1bdd6a01ac48884c62eaf45afc1a36cd 100644
--- a/gpu/command_buffer/common/id_allocator_test.cc
+++ b/gpu/command_buffer/common/id_allocator_test.cc
@@ -50,7 +50,7 @@ TEST_F(IdAllocatorTest, TestAdvanced) {
   IdAllocator *allocator = id_allocator();
 
   // Allocate the highest possible ID, to make life awkward.
-  allocator->AllocateIDAtOrAbove(-1);
+  allocator->AllocateIDAtOrAbove(~static_cast<ResourceId>(0));
 
   // Allocate a significant number of resources.
   const unsigned int kNumResources = 100;
@@ -98,9 +98,9 @@ TEST_F(IdAllocatorTest, AllocateIdAtOrAbove) {
   EXPECT_GT(id3, kOffset);
 }
 
-// Checks that AllocateIdAtOrAbove wraps around at the maximum 32-bit value.
+// Checks that AllocateIdAtOrAbove wraps around at the maximum value.
 TEST_F(IdAllocatorTest, AllocateIdAtOrAboveWrapsAround) {
-  const ResourceId kMaxPossibleOffset = -1;
+  const ResourceId kMaxPossibleOffset = ~static_cast<ResourceId>(0);
   IdAllocator* allocator = id_allocator();
   ResourceId id1 = allocator->AllocateIDAtOrAbove(kMaxPossibleOffset);
   EXPECT_EQ(kMaxPossibleOffset, id1);