Move plugin placeholder style to CSS, and allow it to bypass main world CSP.

Source/core/html/shadow/PluginPlaceholderElement.cpp

Index: Source/core/html/shadow/PluginPlaceholderElement.cpp
diff --git a/Source/core/html/shadow/PluginPlaceholderElement.cpp b/Source/core/html/shadow/PluginPlaceholderElement.cpp
index aeb6d7b90f3b5865b394ccc1d1fa918a34475c08..825fd56868fb9baccfab5a98b3d0802c8ebeb088 100644
--- a/Source/core/html/shadow/PluginPlaceholderElement.cpp
+++ b/Source/core/html/shadow/PluginPlaceholderElement.cpp
@@ -6,8 +6,14 @@
 #include "core/html/shadow/PluginPlaceholderElement.h"
 
 #include "bindings/core/v8/ExceptionState.h"
+#include "bindings/core/v8/ScriptController.h"
 #include "core/CSSPropertyNames.h"
 #include "core/CSSValueKeywords.h"
+#include "core/UserAgentStyleSheets.h"
+#include "core/dom/Document.h"
+#include "core/frame/LocalFrame.h"
+#include "core/html/HTMLStyleElement.h"
+#include "platform/ScriptForbiddenScope.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/text/AtomicString.h"
 
@@ -49,25 +55,26 @@ bool PluginPlaceholderElement::initializePlaceholderElements()
     //   </div>
     // </div>
 
-    // FIXME: Move style out of C++ and into CSS.
+    if (!document().frame())
+        return false;
 
+    ScriptForbiddenScope forbidScript;
+    ScriptController::BypassMainWorldCSP bypassCSP(document().frame()->script());
     TrackExceptionState exceptionState;
 
     DEFINE_STATIC_LOCAL(AtomicString, id, ("plugin-placeholder"));
     setIdAttribute(id);
-    setInlineStyleProperty(CSSPropertyWidth, 100, CSSPrimitiveValue::CSS_PERCENTAGE);
-    setInlineStyleProperty(CSSPropertyHeight, 100, CSSPrimitiveValue::CSS_PERCENTAGE);
-    setInlineStyleProperty(CSSPropertyOverflow, CSSValueHidden);
-    setInlineStyleProperty(CSSPropertyDisplay, CSSValueFlex);
-    setInlineStyleProperty(CSSPropertyAlignItems, CSSValueCenter);
-    setInlineStyleProperty(CSSPropertyBackgroundColor, CSSValueGray);
-    setInlineStyleProperty(CSSPropertyFont, "12px -webkit-control");
+
+    // FIXME: Need to force CSP to permit this element.
+    RefPtrWillBeRawPtr<HTMLStyleElement> styleElement = HTMLStyleElement::create(document(), false);
+    styleElement->setTextContent(String(pluginPlaceholderCss, sizeof(pluginPlaceholderCss)));
+    appendChild(styleElement.release(), exceptionState);
+    if (exceptionState.hadException())
+        return false;
 
     DEFINE_STATIC_LOCAL(AtomicString, contentId, ("plugin-placeholder-content"));
     RefPtrWillBeRawPtr<HTMLDivElement> contentElement = HTMLDivElement::create(document());
     contentElement->setIdAttribute(contentId);
-    contentElement->setInlineStyleProperty(CSSPropertyTextAlign, CSSValueCenter);
-    contentElement->setInlineStyleProperty(CSSPropertyMargin, CSSValueAuto);
 
     DEFINE_STATIC_LOCAL(AtomicString, messageId, ("plugin-placeholder-message"));
     RefPtrWillBeRawPtr<HTMLDivElement> messageElement = HTMLDivElement::create(document());