compositor-worker: cc->blink mutation plumbing

third_party/WebKit/Source/core/dom/Element.cpp

Index: third_party/WebKit/Source/core/dom/Element.cpp
diff --git a/third_party/WebKit/Source/core/dom/Element.cpp b/third_party/WebKit/Source/core/dom/Element.cpp
index 1ef94b7943723c3618177835e2024538c1dc1e0a..fa13ad4a2368160dbd85569e4e069787b35db668 100644
--- a/third_party/WebKit/Source/core/dom/Element.cpp
+++ b/third_party/WebKit/Source/core/dom/Element.cpp
@@ -38,6 +38,7 @@
 #include "core/XMLNames.h"
 #include "core/animation/AnimationTimeline.h"
 #include "core/animation/css/CSSAnimations.h"
+#include "core/css/CSSFunctionValue.h"
 #include "core/css/CSSImageValue.h"
 #include "core/css/CSSStyleSheet.h"
 #include "core/css/CSSValuePool.h"
@@ -123,7 +124,9 @@
 #include "platform/EventDispatchForbiddenScope.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/UserGestureIndicator.h"
+#include "platform/graphics/CompositorMutation.h"
 #include "platform/scroll/ScrollableArea.h"
+#include "platform/transforms/MatrixTransformOperation.h"
 #include "wtf/BitVector.h"
 #include "wtf/HashFunctions.h"
 #include "wtf/text/CString.h"
@@ -993,6 +996,26 @@ void Element::decrementCompositorProxiedProperties(uint32_t mutableProperties)
         setNeedsStyleRecalc(LocalStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::CompositorProxy));
 }
 
+void Element::updateFromMutation(const CompositorMutation& mutation)
+{
+    ASSERT(isStyledElement());
+    TRACE_EVENT0("compositor-worker", "Element::updateFromMutation");

[flackr, 2016/01/22 14:34:41]

We should have a comment that the scroll offset is updated by another code path.
Offhand, I don't remember what that other path was.

+    if (mutation.isOpacityMutated())
+        setInlineStyleProperty(CSSPropertyOpacity, mutation.opacity(), CSSPrimitiveValue::UnitType::Number);
+    if (mutation.isTransformMutated()) {
+        RefPtrWillBeRawPtr<CSSValueList> valueList(CSSValueList::createSpaceSeparated());
+        RefPtrWillBeRawPtr<CSSFunctionValue> matrixValue(CSSFunctionValue::create(CSSValueMatrix3d));
+        for (int col = 0; col < 4; col++) {
+            for (int row = 0; row < 4; row++) {
+                matrixValue->append(cssValuePool().createValue(mutation.transform().get(row, col), CSSPrimitiveValue::UnitType::Pixels));
+            }
+        }
+        valueList->append(matrixValue.release());
+        ensureMutableInlineStyle().setProperty(CSSPropertyTransform, valueList.release());
+        inlineStyleChanged();
+    }
+}
+
 uint32_t Element::compositorMutableProperties() const
 {
     if (!hasRareData())