DevTools: introduce CSS.setStyleText, we'll migrate setPropertyText to it later.

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

Index: LayoutTests/inspector-protocol/css/css-set-style-text-expected.txt
diff --git a/LayoutTests/inspector-protocol/css/css-set-style-text-expected.txt b/LayoutTests/inspector-protocol/css/css-set-style-text-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..11d5160940442266db0548221dc10b39d5bf1c11
--- /dev/null
+++ b/LayoutTests/inspector-protocol/css/css-set-style-text-expected.txt
@@ -0,0 +1,153 @@
+The test verifies functionality of protocol method CSS.setStyleText.
+
+==== Initial style sheet text ====
+#test {
+    box-sizing: border-box;
+}
+
+#test {
+    /* resetting some properties */
+    line-height: 1;
+    font-family: "Arial";
+    color: blue;
+    display: flex; /* flex FTW! */
+}
+
+@media (min-width: 1px) {
+    #test {
+        font-size: 200%;
+    }
+
+    #test {
+    }
+}
+
+
+
+Running test: testBasicSetStyle
+==== Style sheet text ====
+#test {
+    content: 'EDITED';
+}
+
+#test {
+    /* resetting some properties */
+    line-height: 1;
+    font-family: "Arial";
+    color: blue;
+    display: flex; /* flex FTW! */
+}
+
+@media (min-width: 1px) {
+    #test {
+        font-size: 200%;
+    }
+
+    #test {
+    }
+}
+
+
+Dumping matched rules: 
+*#test* {    regular
+    content: 'EDITED';
+}
+*#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
+    }
+
+Running test: testSetStylePoorContent
+Expected protocol error: 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
+    }
+
+Running test: testSetStyleInMedia
+==== Style sheet text ====
+#test {
+    box-sizing: border-box;
+}
+
+#test {
+    /* resetting some properties */
+    line-height: 1;
+    font-family: "Arial";
+    color: blue;
+    display: flex; /* flex FTW! */
+}
+
+@media (min-width: 1px) {
+    #test {
+        content: 'EDITED';
+        color: red;
+        /** foo */
+    }
+
+    #test {
+    }
+}
+
+
+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
+        content: 'EDITED';
+        color: red;
+    }
+@media (min-width: 1px)
+    *#test* {    regular
+    }
+
+Running test: testSetStylePoorRange
+Expected protocol error: Specified range is out of bounds
+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
+    }
+