aw: Hook up gpu client tracing

Make --enable-gpu-client-tracing work for the in-process context on the
render thread. This matches ContextProviderCommandBuffer implementation.

Review-Url: https://codereview.chromium.org/2850713002
Cr-Commit-Position: refs/heads/master@{#468065}

android_webview/browser/aw_render_thread_context_provider.cc

@@ -6,12 +6,15 @@
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
+#include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/output/context_cache_controller.h"
 #include "cc/output/managed_memory_policy.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
 #include "gpu/command_buffer/client/gles2_lib.h"
+#include "gpu/command_buffer/client/gles2_trace_implementation.h"
+#include "gpu/command_buffer/client/gpu_switches.h"
 #include "gpu/command_buffer/client/shared_memory_limits.h"
 #include "gpu/ipc/gl_in_process_context.h"
 #include "gpu/skia_bindings/gl_bindings_skia_cmd_buffer.h"
@@ -69,6 +72,14 @@ AwRenderThreadContextProvider::AwRenderThreadContextProvider(
   context_->GetImplementation()->SetLostContextCallback(base::Bind(
       &AwRenderThreadContextProvider::OnLostContext, base::Unretained(this)));
 
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableGpuClientTracing)) {
+    // This wraps the real GLES2Implementation and we should always use this
+    // instead when it's present.
+    trace_impl_.reset(new gpu::gles2::GLES2TraceImplementation(
+        context_->GetImplementation()));
+  }
+
   cache_controller_.reset(
       new cc::ContextCacheController(context_->GetImplementation(), nullptr));
 }
@@ -98,7 +109,8 @@ gpu::Capabilities AwRenderThreadContextProvider::ContextCapabilities() {
 
 gpu::gles2::GLES2Interface* AwRenderThreadContextProvider::ContextGL() {
   DCHECK(main_thread_checker_.CalledOnValidThread());
-
+  if (trace_impl_)
+    return trace_impl_.get();
   return context_->GetImplementation();
 }
 

android_webview/browser/aw_render_thread_context_provider.h

@@ -22,7 +22,10 @@ class GLSurface;
 
 namespace gpu {
 class GLInProcessContext;
-}
+namespace gles2 {
+class GLES2TraceImplementation;
+}  // namespace gles2
+}  // namespace gpu
 
 namespace android_webview {
 
@@ -59,6 +62,7 @@ class AwRenderThreadContextProvider : public cc::ContextProvider {
   base::ThreadChecker main_thread_checker_;
 
   std::unique_ptr<gpu::GLInProcessContext> context_;
+  std::unique_ptr<gpu::gles2::GLES2TraceImplementation> trace_impl_;
   sk_sp<class GrContext> gr_context_;
   std::unique_ptr<cc::ContextCacheController> cache_controller_;