Fix setComposingText when newCursorPosition != 1

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

Index: content/public/android/javatests/src/org/chromium/content/browser/input/ImeTest.java
diff --git a/content/public/android/javatests/src/org/chromium/content/browser/input/ImeTest.java b/content/public/android/javatests/src/org/chromium/content/browser/input/ImeTest.java
index d8c1eafd3d0bd5bfcd57611609f6201e431798f5..5a97b5e6891c80860a06c19448c5254d7e73f5a4 100644
--- a/content/public/android/javatests/src/org/chromium/content/browser/input/ImeTest.java
+++ b/content/public/android/javatests/src/org/chromium/content/browser/input/ImeTest.java
@@ -104,6 +104,44 @@ public class ImeTest extends ContentShellTestBase {
         resetAllStates();
     }
 
+    @SmallTest
+    @Feature({"TextInput", "Main"})
+    public void testSetComposingTextForDifferentnewCursorPositions() throws Throwable {
+        // When newCursorPosition != 1, setComposingText doesn't work for ReplicaInputConnection
+        // because there is a bug in BaseInputConnection.
+        if (!usingReplicaInputConnection()) {
+            // Cursor is on the right of composing text when newCursorPosition > 0
+            setComposingText("ab", 1);
+            waitAndVerifyUpdateSelection(0, 2, 2, 0, 2);
+
+            finishComposingText();
+            waitAndVerifyUpdateSelection(1, 2, 2, -1, -1);
+
+            // Cursor is on the left of composing text when newCursorPosition <= 0
+            setComposingText("cd", 0);
+            waitAndVerifyUpdateSelection(2, 2, 2, 2, 4);
+
+            // Cursor is on the left boundary

[Changwan Ryu, 2016/04/07 11:46:19]

for the completeness of tests, could you also add test cases for when the new
cursor is between left boundary and composing texts?

+            setComposingText("cd", -2);
+            waitAndVerifyUpdateSelection(3, 0, 0, 2, 4);
+
+            // Cursor exceeds the left boundary
+            setComposingText("cdef", -10);
+            waitAndVerifyUpdateSelection(4, 0, 0, 2, 6);
+
+            finishComposingText();
+            waitAndVerifyUpdateSelection(5, 0, 0, -1, -1);
+
+            // Cursor is on the right boundary

[Changwan Ryu, 2016/04/07 11:46:18]

ditto

+            setComposingText("gh", 7);
+            waitAndVerifyUpdateSelection(6, 8, 8, 0, 2);
+
+            // Cursor exceeds the right boundary
+            setComposingText("ghij", 20);
+            waitAndVerifyUpdateSelection(7, 10, 10, 0, 4);
+        }
+    }
+
     @MediumTest
     @Feature({"TextInput", "Main"})
     public void testKeyboardDismissedAfterClickingGo() throws Throwable {