Implement ThreadedInputConnection#getCursorCapsMode()

Some Latin keyboard apps use this function to check whether they need to
capitalize a letter at the current cursor. Delegating to TextUtil just as
BaseInputConnection#getCursorCapsMode() does.

BUG=648439

Review-Url: https://codereview.chromium.org/2349383004
Cr-Commit-Position: refs/heads/master@{#419929}

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

@@ -7,6 +7,7 @@ package org.chromium.content.browser.input;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
+import android.text.TextUtils;
 import android.view.KeyCharacterMap;
 import android.view.KeyEvent;
 import android.view.View;
@@ -572,9 +573,14 @@ public class ThreadedInputConnection extends BaseInputConnection
      */
     @Override
     public int getCursorCapsMode(int reqModes) {
-        if (DEBUG_LOGS) Log.w(TAG, "getCursorCapsMode [%x]", reqModes);
-        // TODO(changwan): implement this.
-        return 0;
+        TextInputState textInputState = requestAndWaitForTextInputState();
+        int result = 0;
+        if (textInputState != null) {
+            result = TextUtils.getCapsMode(
+                    textInputState.text(), textInputState.selection().start(), reqModes);
+        }
+        if (DEBUG_LOGS) Log.w(TAG, "getCursorCapsMode [%x]: %x", reqModes, result);
+        return result;
     }
 
     /**

content/public/android/javatests/src/org/chromium/content/browser/input/ImeTest.java

@@ -13,6 +13,7 @@ import android.os.Handler;
 import android.os.Looper;
 import android.test.suitebuilder.annotation.MediumTest;
 import android.test.suitebuilder.annotation.SmallTest;
+import android.text.InputType;
 import android.text.TextUtils;
 import android.util.Pair;
 import android.view.KeyEvent;
@@ -1368,6 +1369,23 @@ public class ImeTest extends ContentShellTestBase {
         waitForEventLogs("keydown(229),input,keyup(229),selectionchange,selectionchange");
     }
 
+    @MediumTest
+    @Feature({"TextInput"})
+    @RetryOnFailure
+    public void testGetCursorCapsMode() throws Throwable {
+        commitText("Hello World", 1);
+        waitAndVerifyUpdateSelection(0, 11, 11, -1, -1);
+        assertEquals(0,
+                getCursorCapsMode(InputType.TYPE_TEXT_FLAG_CAP_WORDS));
+        setSelection(6, 6);
+        waitAndVerifyUpdateSelection(1, 6, 6, -1, -1);
+        assertEquals(InputType.TYPE_TEXT_FLAG_CAP_WORDS,
+                getCursorCapsMode(InputType.TYPE_TEXT_FLAG_CAP_WORDS));
+        commitText("\n", 1);
+        assertEquals(InputType.TYPE_TEXT_FLAG_CAP_WORDS,
+                getCursorCapsMode(InputType.TYPE_TEXT_FLAG_CAP_WORDS));
+    }
+
     private void clearEventLogs() throws Exception {
         final String code = "clearEventLogs()";
         JavaScriptUtils.executeJavaScriptAndWaitForResult(
@@ -1771,6 +1789,16 @@ public class ImeTest extends ContentShellTestBase {
         });
     }
 
+    private int getCursorCapsMode(final int reqModes) throws Throwable {
+        final ChromiumBaseInputConnection connection = mConnection;
+        return runBlockingOnImeThread(new Callable<Integer>() {
+            @Override
+            public Integer call() {
+                return connection.getCursorCapsMode(reqModes);
+            }
+        });
+    }
+
     private void dispatchKeyEvent(final KeyEvent event) {
         ThreadUtils.runOnUiThreadBlocking(new Runnable() {
             @Override