Android-side of insertion/selection handles visibility.

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index 1e2073022916117bbd87a6891718301a741791f9..bcd1e9b2da7eb0c4b0142e2cd605e2d6dafdd608 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -357,6 +357,11 @@ public class ContentViewCore
     private final RenderCoordinates.NormalizedPoint mEndHandlePoint;
     private final RenderCoordinates.NormalizedPoint mInsertionHandlePoint;
 
+    // Cached copy of the visible rectangle defined by two points. Needed to determine
+    // visibility of insertion/selection handles.
+    private final RenderCoordinates.NormalizedPoint mTopLeftVisibilityClippingPoint;
+    private final RenderCoordinates.NormalizedPoint mBottomRightVisibilityClippingPoint;
+
     // Tracks whether a selection is currently active.  When applied to selected text, indicates
     // whether the last selected text is still highlighted.
     private boolean mHasSelection;
@@ -455,6 +460,8 @@ public class ContentViewCore
         mStartHandlePoint = mRenderCoordinates.createNormalizedPoint();
         mEndHandlePoint = mRenderCoordinates.createNormalizedPoint();
         mInsertionHandlePoint = mRenderCoordinates.createNormalizedPoint();
+        mTopLeftVisibilityClippingPoint = mRenderCoordinates.createNormalizedPoint();
+        mBottomRightVisibilityClippingPoint = mRenderCoordinates.createNormalizedPoint();
         mAccessibilityManager = (AccessibilityManager)
                 getContext().getSystemService(Context.ACCESSIBILITY_SERVICE);
         mGestureStateListeners = new ObserverList<GestureStateListener>();
@@ -1982,6 +1989,7 @@ public class ContentViewCore
             };
 
             mSelectionHandleController.hideAndDisallowAutomaticShowing();
+            updateInsertionSelectionVisibleBounds();
         }
 
         return mSelectionHandleController;
@@ -2020,6 +2028,7 @@ public class ContentViewCore
             };
 
             mInsertionHandleController.hideAndDisallowAutomaticShowing();
+            updateInsertionSelectionVisibleBounds();
         }
 
         return mInsertionHandleController;
@@ -2508,6 +2517,32 @@ public class ContentViewCore
         }
     }
 
+    @CalledByNative
+    private void setSelectionRootBounds(Rect bounds) {
+        mTopLeftVisibilityClippingPoint.setLocalDip(bounds.left, bounds.top);
+        mBottomRightVisibilityClippingPoint.setLocalDip(bounds.right, bounds.bottom);
+        updateInsertionSelectionVisibleBounds();
+    }
+
+    private void updateInsertionSelectionVisibleBounds() {
+        if (mSelectionHandleController == null && mInsertionHandleController == null) {
+            return;
+        }
+
+        int x1 = Math.round(mTopLeftVisibilityClippingPoint.getXPix());
+        int y1 = Math.round(mTopLeftVisibilityClippingPoint.getYPix());
+        int x2 = Math.round(mBottomRightVisibilityClippingPoint.getXPix());
+        int y2 = Math.round(mBottomRightVisibilityClippingPoint.getYPix());
+
+        if (mSelectionHandleController != null) {
+            mSelectionHandleController.setVisibleClippingRectangle(x1, y1, x2, y2);
+        }
+
+        if (mInsertionHandleController != null) {
+            mInsertionHandleController.setVisibleClippingRectangle(x1, y1, x2, y2);
+        }
+    }
+
     @SuppressWarnings("unused")
     @CalledByNative
     private static void onEvaluateJavaScriptResult(