Bug 1364274 part 1 - Propagate style bits from Servo ComputedValues to ServoStyleContext. r=heycam

MozReview-Commit-ID: KewMPDdX8iy

--HG--
extra : rebase_source : 7e38904b7c5f229e5527b02008cac6459a8bcdc8

layout/style/ServoBindingList.h

@@ -470,6 +470,8 @@ SERVO_BINDING_FUNC(Servo_ComputedValues_Inherit, ServoComputedValuesStrong,
 SERVO_BINDING_FUNC(Servo_ComputedValues_GetVisitedStyle,
                    ServoComputedValuesStrong,
                    ServoComputedValuesBorrowed values)
+SERVO_BINDING_FUNC(Servo_ComputedValues_GetStyleBits, uint64_t,
+                   ServoComputedValuesBorrowed values)
 // Gets the source style rules for the computed values. This returns
 // the result via rules, which would include a list of unowned pointers
 // to RawServoStyleRule.

layout/style/ServoStyleContext.cpp

@@ -22,6 +22,7 @@ ServoStyleContext::ServoStyleContext(nsStyleContext* aParent,
   mSource(Move(aComputedValues))
 {
   mPresContext = aPresContext;
+  AddStyleBit(Servo_ComputedValues_GetStyleBits(mSource));
 
   FinishConstruction();