Roll src/third_party/dawn/ 3fd022ef6..21dfc9195 (2 commits)

https://dawn.googlesource.com/dawn.git/+log/3fd022ef6041..21dfc919547f

$ git log 3fd022ef6..21dfc9195 --date=short --no-merges --format='%ad %ae %s'
2019-10-03 bryan.bernhart Resource Management 7: Device memory sub-allocation using buddy allocator.
2019-10-03 beaufort.francois Add missing optional label member to descriptors

Created with:
  roll-dep src/third_party/dawn

Change-Id: I1011570dcc920cd005ad5bba2a5022f63b595fb5
Bug: 877147
Bug: dawn:22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1839691Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Auto-Submit: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#702849}

DEPS

@@ -302,7 +302,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'dawn_revision': '3fd022ef60417eb15e6d5b82318c763f26024888',
+  'dawn_revision': '21dfc919547fb3b139b56271d1aa09518bd75801',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.

gpu/command_buffer/tests/webgpu_fence_unittest.cc

@@ -56,12 +56,12 @@ TEST_F(WebGPUFenceTest, InitialValue) {
   dawn::Device device = dawn::Device::Acquire(webgpu()->GetDefaultDevice());
   dawn::Queue queue = device.CreateQueue();
   {
-    dawn::FenceDescriptor fence_desc{nullptr, 0};
+    dawn::FenceDescriptor fence_desc{nullptr, nullptr, 0};
     dawn::Fence fence = queue.CreateFence(&fence_desc);
     EXPECT_EQ(fence.GetCompletedValue(), 0u);
   }
   {
-    dawn::FenceDescriptor fence_desc{nullptr, 2};
+    dawn::FenceDescriptor fence_desc{nullptr, nullptr, 2};
     dawn::Fence fence = queue.CreateFence(&fence_desc);
     EXPECT_EQ(fence.GetCompletedValue(), 2u);
   }
@@ -75,7 +75,7 @@ TEST_F(WebGPUFenceTest, GetCompletedValue) {
   }
   dawn::Device device = dawn::Device::Acquire(webgpu()->GetDefaultDevice());
   dawn::Queue queue = device.CreateQueue();
-  dawn::FenceDescriptor fence_desc{nullptr, 0};
+  dawn::FenceDescriptor fence_desc{nullptr, nullptr, 0};
   dawn::Fence fence = queue.CreateFence(&fence_desc);
   queue.Signal(fence, 2u);
   WaitForFence(device, fence, 2u);
@@ -91,7 +91,7 @@ TEST_F(WebGPUFenceTest, OnCompletion) {
   }
   dawn::Device device = dawn::Device::Acquire(webgpu()->GetDefaultDevice());
   dawn::Queue queue = device.CreateQueue();
-  dawn::FenceDescriptor fence_desc{nullptr, 0};
+  dawn::FenceDescriptor fence_desc{nullptr, nullptr, 0};
   dawn::Fence fence = queue.CreateFence(&fence_desc);
   queue.Signal(fence, 2u);
 
@@ -110,7 +110,7 @@ TEST_F(WebGPUFenceTest, SignalManyTimes) {
   }
   dawn::Device device = dawn::Device::Acquire(webgpu()->GetDefaultDevice());
   dawn::Queue queue = device.CreateQueue();
-  dawn::FenceDescriptor fence_desc{nullptr, 0};
+  dawn::FenceDescriptor fence_desc{nullptr, nullptr, 0};
   dawn::Fence fence = queue.CreateFence(&fence_desc);
 
   uint64_t max_value = 1000000u;