Support InputMethodManager#updateCursorAnchorInfo for Android 5.0

content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java

Index: content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java b/content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java
index 75bb44fae0d3d228394b0e9bef71477c02904a08..3dc27066450a87dbbfa3f95d4d8ef8b0e38ac0d5 100644
--- a/content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java
+++ b/content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java
@@ -26,6 +26,7 @@ import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.blink_public.web.WebInputEventModifier;
 import org.chromium.blink_public.web.WebInputEventType;
+import org.chromium.content.browser.RenderCoordinates;
 import org.chromium.ui.base.ime.TextInputType;
 import org.chromium.ui.picker.InputDialogContainer;
 
@@ -101,6 +102,14 @@ public class ImeAdapter {
     // Every time the user, IME, javascript (Blink), autofill etc. modifies the content, the new
     // state must be reflected to this to keep consistency.
     private final Editable mEditable;
+    // This holds the information necessary for constructing CursorAnchorInfo, and notifies to
+    // InputMethodManager on appropriate timing, depending on how IME requested the information
+    // via InputConnection. The update request is per InputConnection, hence for each time it is
+    // re-created, the monitoring status will be reset.
+    private final CursorAnchorInfoController mCursorAnchorInfoController;
+
+    @VisibleForTesting
+    int mLastSyntheticKeyCode;
 
     private int mTextInputType = TextInputType.NONE;
     private int mTextInputFlags;
@@ -122,6 +131,29 @@ public class ImeAdapter {
         // Deep copy newConfig so that we can notice the difference.
         mCurrentConfig = new Configuration(
                 mViewEmbedder.getAttachedView().getResources().getConfiguration());
+        mCursorAnchorInfoController = CursorAnchorInfoController.create(wrapper,
+                new CursorAnchorInfoController.ComposingTextDelegate() {
+                    @Override
+                    public CharSequence getText() {
+                        return mEditable;
+                    }
+                    @Override
+                    public int getSelectionStart() {
+                        return Selection.getSelectionStart(mEditable);
+                    }
+                    @Override
+                    public int getSelectionEnd() {
+                        return Selection.getSelectionEnd(mEditable);
+                    }
+                    @Override
+                    public int getComposingTextStart() {
+                        return BaseInputConnection.getComposingSpanStart(mEditable);
+                    }
+                    @Override
+                    public int getComposingTextEnd() {
+                        return BaseInputConnection.getComposingSpanEnd(mEditable);
+                    }
+                });
     }
 
     /**
@@ -162,6 +194,9 @@ public class ImeAdapter {
         int initialSelEnd = outAttrs.initialSelEnd = Selection.getSelectionEnd(mEditable);
         mInputConnection = mInputConnectionFactory.get(
                 mViewEmbedder.getAttachedView(), this, initialSelStart, initialSelEnd, outAttrs);
+        if (mCursorAnchorInfoController != null) {
+            mCursorAnchorInfoController.resetMonitoringState();
+        }
         if (DEBUG_LOGS) Log.w(TAG, "onCreateInputConnection");
         return mInputConnection;
     }
@@ -174,6 +209,9 @@ public class ImeAdapter {
     @VisibleForTesting
     public void setInputMethodManagerWrapperForTest(InputMethodManagerWrapper immw) {
         mInputMethodManagerWrapper = immw;
+        if (mCursorAnchorInfoController != null) {
+            mCursorAnchorInfoController.setInputMethodManagerWrapper(immw);
+        }
     }
 
     @VisibleForTesting
@@ -285,9 +323,13 @@ public class ImeAdapter {
      */
     public void updateState(String text, int selectionStart, int selectionEnd, int compositionStart,
             int compositionEnd, boolean isNonImeChange) {
-        if (mInputConnection == null) return;
-        mInputConnection.updateState(text, selectionStart, selectionEnd, compositionStart,
-                compositionEnd, isNonImeChange);
+        if (mInputConnection != null) {
+            mInputConnection.updateState(text, selectionStart, selectionEnd, compositionStart,
+                    compositionEnd, isNonImeChange);
+        }
+        if (mCursorAnchorInfoController != null) {
+            mCursorAnchorInfoController.invalidateLastCursorAnchorInfo();
+        }
     }
 
     /**
@@ -562,11 +604,44 @@ public class ImeAdapter {
     @CalledByNative
     private void focusedNodeChanged(boolean isEditable) {
         if (DEBUG_LOGS) Log.w(TAG, "focusedNodeChanged: isEditable [%b]", isEditable);
+
+        // Update controller before the connection is restarted.
+        if (mCursorAnchorInfoController != null) {
+            mCursorAnchorInfoController.focusedNodeChanged(isEditable);
+        }
+
         if (mTextInputType != TextInputType.NONE && mInputConnection != null && isEditable) {
             restartInput();
         }
     }
 
+    public boolean onRequestCursorUpdates(int cursorUpdateMode) {
+        if (mCursorAnchorInfoController == null) return false;
+        return mCursorAnchorInfoController.onRequestCursorUpdates(cursorUpdateMode,
+                mViewEmbedder.getAttachedView());
+    }
+
+    /**
+     * Notify the location of composing characters to the IME if it explicitly requested them.
+     * @param renderCoordinates coordinate information to convert CSS (document) coordinates to
+     * View-local Physical (screen) coordinates
+     * @param hasInsertionMarker Whether the insertion marker is visible or not.
+     * @param insertionMarkerHorizontal X coordinates (in view-local DIP pixels) of the insertion
+     * marker if it exists. Will be ignored otherwise.
+     * @param insertionMarkerTop Y coordinates (in view-local DIP pixels) of the top of the
+     * insertion marker if it exists. Will be ignored otherwise.
+     * @param insertionMarkerBottom Y coordinates (in view-local DIP pixels) of the bottom of
+     * the insertion marker if it exists. Will be ignored otherwise.
+     */
+    public void onUpdateFrameInfo(RenderCoordinates renderCoordinates, boolean hasInsertionMarker,
+            boolean isInsertionMarkerVisible, float insertionMarkerHorizontal,
+            float insertionMarkerTop, float insertionMarkerBottom) {
+        if (mCursorAnchorInfoController == null) return;
+        mCursorAnchorInfoController.onUpdateFrameInfo(renderCoordinates, hasInsertionMarker,
+                isInsertionMarkerVisible, insertionMarkerHorizontal, insertionMarkerTop,
+                insertionMarkerBottom, mViewEmbedder.getAttachedView());
+    }
+
     @CalledByNative
     private void populateUnderlinesFromSpans(CharSequence text, long underlines) {
         if (DEBUG_LOGS) {
@@ -596,9 +671,19 @@ public class ImeAdapter {
     }
 
     @CalledByNative
+    private void setCharacterBounds(float[] characterBounds) {
+        if (mCursorAnchorInfoController == null) return;
+        mCursorAnchorInfoController.setCompositionCharacterBounds(characterBounds);
+    }
+
+    @CalledByNative
     private void detach() {
         if (DEBUG_LOGS) Log.w(TAG, "detach");
         mNativeImeAdapterAndroid = 0;
+        mTextInputType = 0;
+        if (mCursorAnchorInfoController != null) {
+            mCursorAnchorInfoController.focusedNodeChanged(false);
+        }
     }
 
     private native boolean nativeSendSyntheticKeyEvent(long nativeImeAdapterAndroid,