Adding backgroundColor to WebCompositionUnderline and using it for InlineTextBox drawing.

Source/web/tests/WebViewTest.cpp

Index: Source/web/tests/WebViewTest.cpp
diff --git a/Source/web/tests/WebViewTest.cpp b/Source/web/tests/WebViewTest.cpp
index 23caa22d3a262b2e642900d8564ecf6e984b1942..169a1ad4f97836c97092255134f769cf4235cf6c 100644
--- a/Source/web/tests/WebViewTest.cpp
+++ b/Source/web/tests/WebViewTest.cpp
@@ -624,7 +624,7 @@ TEST_F(WebViewTest, SetCompositionFromExistingText)
     WebView* webView = m_webViewHelper.initializeAndLoad(m_baseURL + "input_field_populated.html");
     webView->setInitialFocus(false);
     WebVector<WebCompositionUnderline> underlines(static_cast<size_t>(1));
-    underlines[0] = blink::WebCompositionUnderline(0, 4, 0, false);
+    underlines[0] = blink::WebCompositionUnderline(0, 4, 0, false, 0);
     WebLocalFrameImpl* frame = toWebLocalFrameImpl(webView->mainFrame());
     frame->setEditableSelectionOffsets(4, 10);
     frame->setCompositionFromExistingText(8, 12, underlines);
@@ -651,7 +651,7 @@ TEST_F(WebViewTest, SetCompositionFromExistingTextInTextArea)
     WebView* webView = m_webViewHelper.initializeAndLoad(m_baseURL + "text_area_populated.html");
     webView->setInitialFocus(false);
     WebVector<WebCompositionUnderline> underlines(static_cast<size_t>(1));
-    underlines[0] = blink::WebCompositionUnderline(0, 4, 0, false);
+    underlines[0] = blink::WebCompositionUnderline(0, 4, 0, false, 0);
     WebLocalFrameImpl* frame = toWebLocalFrameImpl(webView->mainFrame());
     frame->setEditableSelectionOffsets(27, 27);
     std::string newLineText("\n");