WIP - compositor worker mega patch.

cc/blink/web_mutator_client_impl.cc

Index: cc/blink/web_mutator_client_impl.cc
diff --git a/cc/blink/web_mutator_client_impl.cc b/cc/blink/web_mutator_client_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a939abd765ecb2be539012b1fcf5f18ef1311c19
--- /dev/null
+++ b/cc/blink/web_mutator_client_impl.cc
@@ -0,0 +1,55 @@
+// Copyright 2015 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 "cc/blink/web_mutator_client_impl.h"
+
+#include "base/trace_event/trace_event.h"
+#include "cc/blink/mutation_conversions.h"
+#include "cc/blink/web_compositor_mutable_state_provider_impl.h"
+#include "third_party/WebKit/public/platform/Platform.h"
+#include "third_party/WebKit/public/platform/WebMutator.h"
+
+namespace cc_blink {
+
+WebMutatorClientImpl::WebMutatorClientImpl(blink::WebMutator* mutator)
+    : client_(nullptr), mutator_(mutator) {
+  TRACE_EVENT0("compositor-worker",
+               "WebMutatorClientImpl::WebMutatorClientImpl");
+}
+
+WebMutatorClientImpl::~WebMutatorClientImpl() {
+  TRACE_EVENT0("compositor-worker",
+               "WebMutatorClientImpl::~WebMutatorClientImpl");
+}
+
+bool WebMutatorClientImpl::Mutate(base::TimeTicks now,
+                                  cc::LayerTreeImpl* state) {
+  TRACE_EVENT0("compositor-worker", "WebMutatorClientImpl::GetMutations");
+  double time = (now - base::TimeTicks()).InSecondsF();
+  if (!mutations_)
+    mutations_.reset(new cc::LayerTreeMutationMap);
+  WebCompositorMutableStateProviderImpl compositor_state(state,
+                                                         mutations_.get());
+  bool should_reinvoke = mutator_->mutate(time, &compositor_state);
+  // TODO(flackr): Detect if there actually were any mutations and set
+  // needs commit?
+  return should_reinvoke;
+}
+
+void WebMutatorClientImpl::SetClient(cc::LayerTreeMutatorClient* client) {
+  TRACE_EVENT0("compositor-worker", "WebMutatorClientImpl::SetClient");
+  client_ = client;
+  setNeedsMutate();
+}
+
+cc::LayerTreeMutationMap* WebMutatorClientImpl::TakeMutations() {
+  return mutations_.release();
+}
+
+void WebMutatorClientImpl::setNeedsMutate() {
+  TRACE_EVENT0("compositor-worker", "WebMutatorClientImpl::requestMutation");
+  client_->SetNeedsMutate();
+}
+
+}  // namespace cc_blink