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

public/blink_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <grit latest_public_release="0" current_release="1">
   <outputs>
     <output filename="grit/blink_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="blink_resources.rc" type="rc_all" />
     <output filename="blink_resources.pak" type="data_package" />
   </outputs>
   <release seq="1">
@@ skipping 32 matching lines @@
       <include name="IDR_INSPECTOR_DEBUGGER_SCRIPT_SOURCE_JS" file="../Source/bindings/core/v8/DebuggerScript.js" type="BINDATA"/>
       <include name="IDR_PICKER_COMMON_JS" file="../Source/web/resources/pickerCommon.js" type="BINDATA"/>
       <include name="IDR_PICKER_COMMON_CSS" file="../Source/web/resources/pickerCommon.css" type="BINDATA"/>
       <include name="IDR_CALENDAR_PICKER_CSS" file="../Source/web/resources/calendarPicker.css" type="BINDATA"/>
       <include name="IDR_CALENDAR_PICKER_JS" file="../Source/web/resources/calendarPicker.js" type="BINDATA"/>
       <include name="IDR_PICKER_BUTTON_CSS" file="../Source/web/resources/pickerButton.css" type="BINDATA"/>
       <include name="IDR_SUGGESTION_PICKER_CSS" file="../Source/web/resources/suggestionPicker.css" type="BINDATA"/>
       <include name="IDR_SUGGESTION_PICKER_JS" file="../Source/web/resources/suggestionPicker.js" type="BINDATA"/>
       <include name="IDR_COLOR_SUGGESTION_PICKER_CSS" file="../Source/web/resources/colorSuggestionPicker.css" type="BINDATA"/>
       <include name="IDR_COLOR_SUGGESTION_PICKER_JS" file="../Source/web/resources/colorSuggestionPicker.js" type="BINDATA"/>
+      <include name="IDR_PLUGIN_PLACEHOLDER_ELEMENT_CSS" file="../Source/core/html/shadow/PluginPlaceholderElement.css" type="BINDATA"/>

[jbroman, 2014/09/02 15:44:04]

According to http://crbug.com/312586, this is the "not ready yet" approach (and
the various Python scripts to generated .h files are the deprecated way) to get
resources in Blink.

Unfortunately this approach requires a 3-sided change (as BlinkPlatformImpl
needs to know about new resources), and the build system does not seem to
correctly understand dependencies (I've needed to clobber it to see changes in
the .css file).

If that doesn't get better before this is ready to land, I'll probably move it
back to make-file-arrays.py instead.

       <if expr="pp_ifdef('use_concatenated_impulse_responses')">
         <include name="IDR_AUDIO_SPATIALIZATION_COMPOSITE" file="../Source/platform/audio/resources/Composite.wav" type="BINDATA"/>
       </if>
       <if expr="not pp_ifdef('use_concatenated_impulse_responses')">
         <include name="IDR_AUDIO_SPATIALIZATION_T000_P000" file="..\Source\platform\audio\resources\IRC_Composite_C_R0195_T000_P000.wav" type="BINDATA"/>
         <include name="IDR_AUDIO_SPATIALIZATION_T000_P015" file="..\Source\platform\audio\resources\IRC_Composite_C_R0195_T000_P015.wav" type="BINDATA"/>
         <include name="IDR_AUDIO_SPATIALIZATION_T000_P030" file="..\Source\platform\audio\resources\IRC_Composite_C_R0195_T000_P030.wav" type="BINDATA"/>
         <include name="IDR_AUDIO_SPATIALIZATION_T000_P045" file="..\Source\platform\audio\resources\IRC_Composite_C_R0195_T000_P045.wav" type="BINDATA"/>
         <include name="IDR_AUDIO_SPATIALIZATION_T000_P060" file="..\Source\platform\audio\resources\IRC_Composite_C_R0195_T000_P060.wav" type="BINDATA"/>
         <include name="IDR_AUDIO_SPATIALIZATION_T000_P075" file="..\Source\platform\audio\resources\IRC_Composite_C_R0195_T000_P075.wav" type="BINDATA"/>
@@ skipping 228 matching lines @@
         <include name="IDR_AUDIO_SPATIALIZATION_T345_P060" file="..\Source\platform\audio\resources\IRC_Composite_C_R0195_T345_P060.wav" type="BINDATA"/>
         <include name="IDR_AUDIO_SPATIALIZATION_T345_P075" file="..\Source\platform\audio\resources\IRC_Composite_C_R0195_T345_P075.wav" type="BINDATA"/>
         <include name="IDR_AUDIO_SPATIALIZATION_T345_P090" file="..\Source\platform\audio\resources\IRC_Composite_C_R0195_T345_P090.wav" type="BINDATA"/>
         <include name="IDR_AUDIO_SPATIALIZATION_T345_P315" file="..\Source\platform\audio\resources\IRC_Composite_C_R0195_T345_P315.wav" type="BINDATA"/>
         <include name="IDR_AUDIO_SPATIALIZATION_T345_P330" file="..\Source\platform\audio\resources\IRC_Composite_C_R0195_T345_P330.wav" type="BINDATA"/>
         <include name="IDR_AUDIO_SPATIALIZATION_T345_P345" file="..\Source\platform\audio\resources\IRC_Composite_C_R0195_T345_P345.wav" type="BINDATA"/>
       </if>
     </includes>
   </release>
 </grit>