[DevTools] Handle emulation in embedder, call into web API.

content/common/devtools_messages.h

Index: content/common/devtools_messages.h
diff --git a/content/common/devtools_messages.h b/content/common/devtools_messages.h
index d91498ed9968d35a59e8b2d2060172846c1742eb..11f6ae3a7bec110d5e6caf19e11378f895f5a162 100644
--- a/content/common/devtools_messages.h
+++ b/content/common/devtools_messages.h
@@ -46,12 +46,30 @@
 #include "content/public/common/common_param_traits.h"
 #include "content/public/common/console_message_level.h"
 #include "ipc/ipc_message_macros.h"
+#include "third_party/WebKit/public/web/WebDeviceEmulationParams.h"
 
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT CONTENT_EXPORT
 
 #define IPC_MESSAGE_START DevToolsMsgStart
 
+IPC_ENUM_TRAITS_MAX_VALUE(blink::WebDeviceEmulationParams::ScreenPosition,
+                          blink::WebDeviceEmulationParams::ScreenPositionLast)
+
+IPC_STRUCT_TRAITS_BEGIN(blink::WebSize)
+  IPC_STRUCT_TRAITS_MEMBER(width)
+  IPC_STRUCT_TRAITS_MEMBER(height)
+IPC_STRUCT_TRAITS_END()
+
+IPC_STRUCT_TRAITS_BEGIN(blink::WebDeviceEmulationParams)
+  IPC_STRUCT_TRAITS_MEMBER(screenPosition)
+  IPC_STRUCT_TRAITS_MEMBER(deviceScaleFactor)
+  IPC_STRUCT_TRAITS_MEMBER(viewSize)
+  IPC_STRUCT_TRAITS_MEMBER(fitToView)
+  IPC_STRUCT_TRAITS_MEMBER(offset)
+  IPC_STRUCT_TRAITS_MEMBER(scale)
+IPC_STRUCT_TRAITS_END()
+
 // These are messages sent from DevToolsAgent to DevToolsClient through the
 // browser.
 
@@ -114,6 +132,13 @@ IPC_MESSAGE_ROUTED2(DevToolsAgentMsg_AddMessageToConsole,
 IPC_MESSAGE_ROUTED0(DevToolsMsg_SetupDevToolsClient)
 
 
+// Enables device emulation.
+IPC_MESSAGE_ROUTED1(DevToolsMsg_EnableDeviceEmulation,
+                    blink::WebDeviceEmulationParams /* params */)
+
+// Disables device emulation, enabled previously by EnableDeviceEmulation.
+IPC_MESSAGE_ROUTED0(DevToolsMsg_DisableDeviceEmulation)
+
 //-----------------------------------------------------------------------------
 // These are messages sent from the renderer to the browser.