Support InputMethodManager#updateCursorAnchorInfo for Android 5.0 (C++ version)

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 9246385f8588d6205b54339e37e350166fdcc358..6ed1d8d5ba6befd1c42361b3a211ef4d2d1312e2 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
@@ -425,6 +425,9 @@ public class ContentViewCore
     // Cached copy of all positions and scales as reported by the renderer.
     private final RenderCoordinates mRenderCoordinates;
 
+    // Buffer to receive return value from View#getLocationOnScreen(int[]).
+    private final int[] mGetLocationOnScreenBuffer = new int[2];
+
     // Tracks whether a selection is currently active.  When applied to selected text, indicates
     // whether the last selected text is still highlighted.
     private boolean mHasSelection;
@@ -3073,6 +3076,13 @@ public class ContentViewCore
         mContextualSearchClient = contextualSearchClient;
     }
 
+    @CalledByNative
+    private long getLocationOnScreen() {
+        // TODO(yukawa): ViewPositionObserver has similar logic. Try to merge them.
+        mContainerView.getLocationInWindow(mGetLocationOnScreenBuffer);
+        return ((long) mGetLocationOnScreenBuffer[0]) << 32 | mGetLocationOnScreenBuffer[1];
+    }
+
     private native WebContents nativeGetWebContentsAndroid(long nativeContentViewCoreImpl);
 
     private native void nativeOnJavaContentViewCoreDestroyed(long nativeContentViewCoreImpl);