We would like to remove the word impl_ in the name of all private methods and members. This will make the implementation and review of JDK-8144585 easier:

./modules/graphics/src/main/java/javafx/scene/effect/FloatMap.java: private void impl_update() {
./modules/graphics/src/main/java/javafx/scene/effect/FloatMap.java: private void impl_markDirty() {
./modules/graphics/src/main/java/javafx/scene/effect/FloatMap.java: private void impl_clearDirty() {
./modules/graphics/src/main/java/javafx/scene/image/Image.java: private final InputStream impl_source;
./modules/graphics/src/main/java/javafx/scene/Node.java: private double impl_computeAreaInScreen() {
./modules/graphics/src/main/java/javafx/scene/Node.java: private BooleanProperty impl_showMnemonics;
./modules/graphics/src/main/java/javafx/scene/Parent.java: private javafx.beans.property.ObjectProperty<ParentTraversalEngine> impl_traversalEngine;
./modules/graphics/src/main/java/javafx/scene/Scene.java: private TKScene impl_peer;
./modules/graphics/src/main/java/javafx/scene/shape/Path.java: private boolean impl_isFirstPathElementValid() {
./modules/graphics/src/main/java/javafx/scene/text/Text.java: private ObjectProperty<PathElement[]> impl_selectionShape;
./modules/graphics/src/main/java/javafx/scene/text/Text.java: private ObjectBinding<PathElement[]> impl_selectionBinding;
./modules/graphics/src/main/java/javafx/scene/text/Text.java: private IntegerProperty impl_selectionStart;
./modules/graphics/src/main/java/javafx/scene/text/Text.java: private IntegerProperty impl_selectionEnd;
./modules/graphics/src/main/java/javafx/scene/text/Text.java: private ObjectProperty<PathElement[]> impl_caretShape;
./modules/graphics/src/main/java/javafx/scene/text/Text.java: private ObjectBinding<PathElement[]> impl_caretBinding;
./modules/graphics/src/main/java/javafx/scene/text/Text.java: private IntegerProperty impl_caretPosition;
./modules/graphics/src/main/java/javafx/scene/text/Text.java: private BooleanProperty impl_caretBias;
./modules/graphics/src/main/java/javafx/scene/transform/Transform.java: private WeakReferenceQueue impl_nodes = new WeakReferenceQueue();