[compositorworker] compositor proxy mutation updates underlying layers

third_party/WebKit/Source/web/CompositorProxyClientImpl.cpp

Index: third_party/WebKit/Source/web/CompositorProxyClientImpl.cpp
diff --git a/third_party/WebKit/Source/web/CompositorProxyClientImpl.cpp b/third_party/WebKit/Source/web/CompositorProxyClientImpl.cpp
index f477ca2bcabce6c21fc276dd52f500bc44077150..907e0f12bc5e52e262aa12bf51e45ec59157584d 100644
--- a/third_party/WebKit/Source/web/CompositorProxyClientImpl.cpp
+++ b/third_party/WebKit/Source/web/CompositorProxyClientImpl.cpp
@@ -7,6 +7,7 @@
 #include "core/dom/CompositorProxy.h"
 #include "modules/compositorworker/CompositorWorkerGlobalScope.h"
 #include "platform/TraceEvent.h"
+#include "platform/graphics/CompositorMutableStateProvider.h"
 #include "web/CompositorMutatorImpl.h"
 #include "wtf/CurrentTime.h"
 
@@ -42,7 +43,7 @@ void CompositorProxyClientImpl::requestAnimationFrame()
     m_mutator->setNeedsMutate();
 }
 
-bool CompositorProxyClientImpl::mutate(double monotonicTimeNow)
+bool CompositorProxyClientImpl::mutate(double monotonicTimeNow, CompositorMutableStateProvider* stateProvider)
 {
     if (!m_globalScope)
         return false;
@@ -51,7 +52,9 @@ bool CompositorProxyClientImpl::mutate(double monotonicTimeNow)
     if (!m_requestedAnimationFrameCallbacks)
         return false;
 
+    updateMutableStateForCompositorProxies(stateProvider);

[jbroman, 2016/06/13 19:45:17]

Mind clarifying what's going on here? I think I get it (the state is only
available during the animation frame callbacks), but I think it bears some
explanation.

[majidvp, 2016/06/13 21:52:51]

Yes. Proxies may only mutate the tree during rAF. I will add a comment.

     m_requestedAnimationFrameCallbacks = executeAnimationFrameCallbacks(monotonicTimeNow);
+    updateMutableStateForCompositorProxies(nullptr);
 
     return m_requestedAnimationFrameCallbacks;
 }
@@ -59,10 +62,16 @@ bool CompositorProxyClientImpl::mutate(double monotonicTimeNow)
 bool CompositorProxyClientImpl::executeAnimationFrameCallbacks(double monotonicTimeNow)
 {
     TRACE_EVENT0("compositor-worker", "CompositorProxyClientImpl::executeAnimationFrameCallbacks");
+
     // Convert to zero based document time in milliseconds consistent with requestAnimationFrame.
     double highResTimeMs = 1000.0 * (monotonicTimeNow - m_globalScope->timeOrigin());
-    const bool shouldReinvoke = m_globalScope->executeAnimationFrameCallbacks(highResTimeMs);
-    return shouldReinvoke;
+    return m_globalScope->executeAnimationFrameCallbacks(highResTimeMs);
+}
+
+void CompositorProxyClientImpl::updateMutableStateForCompositorProxies(CompositorMutableStateProvider* stateProvider)
+{
+    for (CompositorProxy* proxy : m_proxies)
+        proxy->takeCompositorMutableState(stateProvider ? stateProvider->getMutableStateFor(proxy->elementId()) : nullptr);
 }
 
 void CompositorProxyClientImpl::registerCompositorProxy(CompositorProxy* proxy)