Update Android port

* java/org/gnu/emacs/EmacsInputConnection.java
(EmacsInputConnection, beginBatchEdit, reset, endBatchEdit):
Keep track of the number of batch edits and return an
appropriate value.
(takeSnapshot): Implement function.
* java/org/gnu/emacs/EmacsNative.java (takeSnapshot): New
function.
* java/org/gnu/emacs/EmacsService.java (resetIC): Improve
debugging output.
* java/org/gnu/emacs/EmacsView.java (onCreateInputConnection):
Call `reset' to clear the UI side batch edit count.
* src/androidterm.c (struct
android_get_surrounding_text_context): New fields
`conversion_start' and `conversion_end'.
(android_get_surrounding_text): Return the conversion region.
(android_get_surrounding_text_internal, NATIVE_NAME): Factor out
`getSurroundingText'.
(takeSnapshot): New function.

java/org/gnu/emacs/EmacsInputConnection.java

@@ -50,6 +50,11 @@ public final class EmacsInputConnection implements InputConnection
   /* The handle ID associated with that view's window.  */
   private short windowHandle;
 
+  /* Number of batch edits currently underway.  Used to avoid
+     synchronizing with the Emacs thread after each
+     `endBatchEdit'.  */
+  private int batchEditCount;
+
   /* Whether or not to synchronize and call `updateIC' with the
      selection position after committing text.
 
@@ -110,6 +115,10 @@ public final class EmacsInputConnection implements InputConnection
       Log.d (TAG, "beginBatchEdit");
 
     EmacsNative.beginBatchEdit (windowHandle);
+
+    /* Keep a record of the number of outstanding batch edits here as
+       well.  */
+    batchEditCount++;
     return true;
   }
 
@@ -125,7 +134,14 @@ public final class EmacsInputConnection implements InputConnection
       Log.d (TAG, "endBatchEdit");
 
     EmacsNative.endBatchEdit (windowHandle);
-    return true;
+
+    /* Subtract one from the UI thread record of the number of batch
+       edits currently under way.  */
+
+    if (batchEditCount > 0)
+      batchEditCount -= 1;
+
+    return batchEditCount > 0;
   }
 
   public boolean
@@ -584,6 +600,42 @@ public final class EmacsInputConnection implements InputConnection
     return text;
   }
 
+  @Override
+  public TextSnapshot
+  takeSnapshot ()
+  {
+    TextSnapshot snapshot;
+
+    /* Return if the input connection is out of date.  */
+    if (view.icSerial < view.icGeneration)
+      return null;
+
+    snapshot = EmacsNative.takeSnapshot (windowHandle);
+
+    if (EmacsService.DEBUG_IC)
+      Log.d (TAG, ("takeSnapshot: "
+		   + snapshot.getSurroundingText ().getText ()
+		   + " @ " + snapshot.getCompositionEnd ()
+		   + ", " + snapshot.getCompositionStart ()));
+
+    return snapshot;
+  }
+
+  @Override
+  public void
+  closeConnection ()
+  {
+    batchEditCount = 0;
+  }
+
+
+
+  public void
+  reset ()
+  {
+    batchEditCount = 0;
+  }
+
 
   /* Override functions which are not implemented.  */
 
@@ -594,13 +646,6 @@ public final class EmacsInputConnection implements InputConnection
     return null;
   }
 
-  @Override
-  public void
-  closeConnection ()
-  {
-
-  }
-
   @Override
   public boolean
   commitContent (InputContentInfo inputContentInfo, int flags,
@@ -616,13 +661,6 @@ public final class EmacsInputConnection implements InputConnection
     return false;
   }
 
-  @Override
-  public TextSnapshot
-  takeSnapshot ()
-  {
-    return null;
-  }
-
   @Override
   public boolean
   clearMetaKeyStates (int states)