Fix RGBA alpha parsing and serialization to adhere to W3 standard.

third_party/WebKit/Source/web/tests/WebViewTest.cpp

Index: third_party/WebKit/Source/web/tests/WebViewTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/WebViewTest.cpp b/third_party/WebKit/Source/web/tests/WebViewTest.cpp
index 05efa641d63fe0c766cee63a5bba27c1992cdda0..ce611195971362ed762658c5a7b36031ce244134 100644
--- a/third_party/WebKit/Source/web/tests/WebViewTest.cpp
+++ b/third_party/WebKit/Source/web/tests/WebViewTest.cpp
@@ -395,11 +395,11 @@ TEST_P(WebViewTest, SetBaseBackgroundColor) {
                                    "style></head></html>",
                                    baseURL);
   // Expected: red (50% alpha) blended atop base of kBlue.
-  EXPECT_EQ(0xFF7F0080, webView->backgroundColor());
+  EXPECT_EQ(0xFF80007F, webView->backgroundColor());
 
   webView->setBaseBackgroundColor(kTranslucentPutty);
   // Expected: red (50% alpha) blended atop kTranslucentPutty. Note the alpha.
-  EXPECT_EQ(0xBFE93B32, webView->backgroundColor());
+  EXPECT_EQ(0xBFE93A31, webView->backgroundColor());
 
   webView->setBaseBackgroundColor(kTransparent);
   FrameTestHelpers::loadHTMLString(webView->mainFrame(),