gpu: Add missing semicolons to TRACE_EVENTs

Chrome is about to switch to the TRACE_EVENT macro implementation
provided by Perfetto. The new implementation requires trace event
statements to be terminated by semicolons, so this patch modifies the
codebase to add semicolons where they were previously left out.

No functional changes.

Bug: 1006541
Change-Id: Ib3bc7a006ba42ff2d9065b80a61067cab82c1fda
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2628993
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Auto-Submit: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843711}

gpu/ipc/in_process_command_buffer.cc

@@ -260,7 +260,7 @@ gpu::ContextResult InProcessCommandBuffer::Initialize(
     gpu::raster::GrShaderCache* gr_shader_cache,
     GpuProcessActivityFlags* activity_flags) {
   DCHECK_CALLED_ON_VALID_SEQUENCE(client_sequence_checker_);
-  TRACE_EVENT0("gpu", "InProcessCommandBuffer::Initialize")
+  TRACE_EVENT0("gpu", "InProcessCommandBuffer::Initialize");
 
   is_offscreen_ = is_offscreen;
   gpu_memory_buffer_manager_ = gpu_memory_buffer_manager;
@@ -328,7 +328,7 @@ gpu::ContextResult InProcessCommandBuffer::Initialize(
 gpu::ContextResult InProcessCommandBuffer::InitializeOnGpuThread(
     const InitializeOnGpuThreadParams& params) {
   DCHECK_CALLED_ON_VALID_SEQUENCE(gpu_sequence_checker_);
-  TRACE_EVENT0("gpu", "InProcessCommandBuffer::InitializeOnGpuThread")
+  TRACE_EVENT0("gpu", "InProcessCommandBuffer::InitializeOnGpuThread");
   UpdateActiveUrl();
 
   if (params.gpu_dependency) {