Add UI considerations to layers

companion fix is in external/webkit

- Add class to return view metrics.
- Draw cursor rings and find matches in proper order.

http://b/2369549

core/java/android/webkit/WebView.java

@@ -3105,11 +3105,26 @@ public class WebView extends AbsoluteLayout
         }
     }
 
+    private static class Metrics {
+        int mScrollX;
+        int mScrollY;
+        int mWidth;
+        int mHeight;
+        float mScale;
+    }
+
+    private Metrics getViewMetrics() {
+        Metrics metrics = new Metrics();
+        metrics.mScrollX = mScrollX;
+        metrics.mScrollY = computeVerticalScrollOffset();
+        metrics.mWidth = getWidth();
+        metrics.mHeight = getHeight() - getVisibleTitleHeight();
+        metrics.mScale = mActualScale;
+        return metrics;
+    }
+
     private void drawLayers(Canvas canvas) {
         if (mRootLayer != 0) {
-            int scrollY = computeVerticalScrollOffset();
-            int viewHeight = getHeight() - getVisibleTitleHeight();
-
             // Currently for each draw we compute the animation values;
             // We may in the future decide to do that independently.
             if (nativeEvaluateLayersAnimations(mRootLayer)) {
@@ -3119,9 +3134,7 @@ public class WebView extends AbsoluteLayout
             }
 
             // We can now draw the layers.
-            nativeDrawLayers(mRootLayer, mScrollX, scrollY,
-                             getWidth(), viewHeight,
-                             mActualScale, canvas);
+            nativeDrawLayers(mRootLayer, canvas);
         }
     }
 
@@ -3209,7 +3222,15 @@ public class WebView extends AbsoluteLayout
 
         mWebViewCore.drawContentPicture(canvas, color,
                 (animateZoom || mPreviewZoomOnly), animateScroll);
-
+        boolean cursorIsInLayer = nativeCursorIsInLayer();
+        if (drawCursorRing && !cursorIsInLayer) {
+            nativeDrawCursorRing(canvas);
+        }
+        // When the FindDialog is up, only draw the matches if we are not in
+        // the process of scrolling them into view.
+        if (mFindIsUp && !animateScroll) {
+            nativeDrawMatches(canvas);
+        }
         drawLayers(canvas);
 
         if (mNativeClass == 0) return;
@@ -3232,12 +3253,7 @@ public class WebView extends AbsoluteLayout
                             LONG_PRESS_TIMEOUT);
                 }
             }
-            nativeDrawCursorRing(canvas);
-        }
-        // When the FindDialog is up, only draw the matches if we are not in
-        // the process of scrolling them into view.
-        if (mFindIsUp && !animateScroll) {
-            nativeDrawMatches(canvas);
+            if (cursorIsInLayer) nativeDrawCursorRing(canvas);
         }
         if (mFocusSizeChanged) {
             mFocusSizeChanged = false;
@@ -5952,6 +5968,7 @@ public class WebView extends AbsoluteLayout
                 case SET_ROOT_LAYER_MSG_ID: {
                     int oldLayer = mRootLayer;
                     mRootLayer = msg.arg1;
+                    nativeSetRootLayer(mRootLayer);
                     if (oldLayer > 0) {
                         nativeDestroyLayer(oldLayer);
                     }
@@ -6715,6 +6732,7 @@ public class WebView extends AbsoluteLayout
     /* package */ native boolean nativeCursorMatchesFocus();
     private native boolean  nativeCursorIntersects(Rect visibleRect);
     private native boolean  nativeCursorIsAnchor();
+    private native boolean  nativeCursorIsInLayer();
     private native boolean  nativeCursorIsTextInput();
     private native Point    nativeCursorPosition();
     private native String   nativeCursorText();
@@ -6728,10 +6746,7 @@ public class WebView extends AbsoluteLayout
     private native void     nativeDrawCursorRing(Canvas content);
     private native void     nativeDestroyLayer(int layer);
     private native boolean  nativeEvaluateLayersAnimations(int layer);
-    private native void     nativeDrawLayers(int layer,
-                                             int scrollX, int scrollY,
-                                             int width, int height,
-                                             float scale, Canvas canvas);
+    private native void     nativeDrawLayers(int layer, Canvas canvas);
     private native void     nativeDrawMatches(Canvas canvas);
     private native void     nativeDrawSelectionPointer(Canvas content,
             float scale, int x, int y, boolean extendSelection);
@@ -6781,6 +6796,7 @@ public class WebView extends AbsoluteLayout
     private native void     nativeSetFindIsUp();
     private native void     nativeSetFollowedLink(boolean followed);
     private native void     nativeSetHeightCanMeasure(boolean measure);
+    private native void     nativeSetRootLayer(int layer);
     private native int      nativeTextGeneration();
     // Never call this version except by updateCachedTextfield(String) -
     // we always want to pass in our generation number.