DevTools: [CSS] Add CSS.setMultipleStyleTexts command to CSS domain

third_party/WebKit/LayoutTests/inspector-protocol/css/css-set-style-text-expected.txt

-The test verifies functionality of protocol method CSS.setStyleText.
+The test verifies functionality of protocol method CSS.setStyleTexts.
 
 ==== Initial style sheet text ====
 #test {
     box-sizing: border-box;
 }
 
 #test {
     /* resetting some properties */
     line-height: 1;
     font-family: "Arial";
@@ skipping 198 matching lines @@
 @media (min-width: 1px)
     *#test* {    regular
         font-size: 200%;
     }
 @media (min-width: 1px)
     *#test* {    regular
     }
 Dumping inherited rules: 
 
 Running test: testSetStylePoorContent
-Expected protocol error: SyntaxError Style text is not valid.
+Expected protocol error: Failed applying edit #0: SyntaxError Style text is not valid.
 Dumping matched rules: 
 *#test* {    regular
     box-sizing: border-box;
 }
 *#test* {    regular
     line-height: 1;
     font-family: "Arial";
     color: blue;
     display: flex;
 }
@@ skipping 107 matching lines @@
 @media (min-width: 1px)
     *#test* {    regular
         font-size: 200%;
     }
 @media (min-width: 1px)
     *#test* {    regular
     }
 Dumping inherited rules: 
 
 Running test: testSetStyleOpenComment
-Expected protocol error: SyntaxError Style text is not valid.
+Expected protocol error: Failed applying edit #0: SyntaxError Style text is not valid.
 Dumping matched rules: 
 *#test* {    regular
     box-sizing: border-box;
 }
 *#test* {    regular
     line-height: 1;
     font-family: "Arial";
     color: blue;
     display: flex;
 }
 @media (min-width: 1px)
     *#test* {    regular
         font-size: 200%;
     }
 @media (min-width: 1px)
     *#test* {    regular
     }
 Dumping inherited rules: 
 
 Running test: testSetStyleOfRemovedRule
-ERROR: NotFoundError Source range didn't match existing style source range
+ERROR: Failed applying edit #0: NotFoundError Source range didn't match existing style source range