Add new API for only moving the selection extent point.

Source/web/tests/WebFrameTest.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 4096 matching lines @@
 
     // If the selection is editable text, we can't extend it into non-editable text.
     frame->executeScript(WebScriptSource("selectElement('editable_1');"));
     EXPECT_EQ("Editable 1.", selectionAsString(frame));
     frame->selectRange(topLeft(elementBounds(frame, "editable_1")), bottomRightMinusOne(elementBounds(frame, "footer_1")));
     // positionForPoint returns the wrong values for contenteditable spans. See
     // http://crbug.com/238334.
     // EXPECT_EQ("Editable 1. Editable 2. ]", selectionAsString(frame));
 }
 
+TEST_F(WebFrameTest, MoveRangeSelectionExtent)
+{
+    WebLocalFrameImpl* frame;
+    WebRect startWebRect;
+    WebRect endWebRect;
+
+    registerMockedHttpURLLoad("move_range_selection_extent.html");
+
+    FrameTestHelpers::WebViewHelper webViewHelper;
+    initializeTextSelectionWebView(m_baseURL + "move_range_selection_extent.html", &webViewHelper);
+    frame = toWebLocalFrameImpl(webViewHelper.webView()->mainFrame());
+    EXPECT_EQ("This text is initially selected.", selectionAsString(frame));
+    webViewHelper.webView()->selectionBounds(startWebRect, endWebRect);
+
+    frame->moveRangeSelectionExtent(WebPoint(640, 480));
+    EXPECT_EQ("This text is initially selected. 16-char footer.", selectionAsString(frame));
+
+    frame->moveRangeSelectionExtent(WebPoint(0, 0));
+    EXPECT_EQ("16-char header. ", selectionAsString(frame));
+
+    // Reset with swapped base and extent.
+    frame->selectRange(topLeft(endWebRect), bottomRightMinusOne(startWebRect));
+    EXPECT_EQ("This text is initially selected.", selectionAsString(frame));
+
+    frame->moveRangeSelectionExtent(WebPoint(640, 480));
+    EXPECT_EQ(" 16-char footer.", selectionAsString(frame));
+
+    frame->moveRangeSelectionExtent(WebPoint(0, 0));
+    EXPECT_EQ("16-char header. This text is initially selected.", selectionAsString(frame));
+
+    frame->executeCommand(WebString::fromUTF8("Unselect"));
+    EXPECT_EQ("", selectionAsString(frame));
+}
+
+TEST_F(WebFrameTest, MoveRangeSelectionExtentCannotCollapse)
+{
+    WebLocalFrameImpl* frame;
+    WebRect startWebRect;
+    WebRect endWebRect;
+
+    registerMockedHttpURLLoad("move_range_selection_extent.html");
+
+    FrameTestHelpers::WebViewHelper webViewHelper;
+    initializeTextSelectionWebView(m_baseURL + "move_range_selection_extent.html", &webViewHelper);
+    frame = toWebLocalFrameImpl(webViewHelper.webView()->mainFrame());
+    EXPECT_EQ("This text is initially selected.", selectionAsString(frame));
+    webViewHelper.webView()->selectionBounds(startWebRect, endWebRect);
+
+    frame->moveRangeSelectionExtent(bottomRightMinusOne(startWebRect));
+    EXPECT_EQ("This text is initially selected.", selectionAsString(frame));
+
+    // Reset with swapped base and extent.
+    frame->selectRange(topLeft(endWebRect), bottomRightMinusOne(startWebRect));
+    EXPECT_EQ("This text is initially selected.", selectionAsString(frame));
+
+    frame->moveRangeSelectionExtent(bottomRightMinusOne(endWebRect));
+    EXPECT_EQ("This text is initially selected.", selectionAsString(frame));
+}
+
 static int computeOffset(RenderObject* renderer, int x, int y)
 {
     return VisiblePosition(renderer->positionForPoint(LayoutPoint(x, y))).deepEquivalent().computeOffsetInContainerNode();
 }
 
 // positionForPoint returns the wrong values for contenteditable spans. See
 // http://crbug.com/238334.
 TEST_F(WebFrameTest, DISABLED_PositionForPointTest)
 {
     registerMockedHttpURLLoad("select_range_span_editable.html");
@@ skipping 2595 matching lines @@
     EXPECT_EQ(1u, frameClient.navigationalDataReceivedCount());
 
     // Neither should a page reload.
     localFrame->reload();
     EXPECT_EQ(4u, frameClient.provisionalLoadCount());
     EXPECT_FALSE(frameClient.wasLastProvisionalLoadATransition());
     EXPECT_EQ(1u, frameClient.navigationalDataReceivedCount());
 }
 
 } // namespace