OOPIF support for layout test pixel dumps.

content/shell/common/shell_messages.h

Index: content/shell/common/shell_messages.h
diff --git a/content/shell/common/shell_messages.h b/content/shell/common/shell_messages.h
index db671cd895c8ca9a40562e734c386975a581ec8a..295fe31f18140bd9c3355a8664b993d140aeecbe 100644
--- a/content/shell/common/shell_messages.h
+++ b/content/shell/common/shell_messages.h
@@ -46,6 +46,11 @@ IPC_MESSAGE_ROUTED0(ShellViewMsg_TryLeakDetection)
 IPC_MESSAGE_ROUTED1(ShellViewMsg_LayoutDumpCompleted,
                     std::string /* completed/stitched layout dump */)
 
+// Notifies BlinkTestRunner that the pixel dump has completed
+// (and that it can proceed with finishing up the test).
+IPC_MESSAGE_ROUTED1(ShellViewMsg_PixelsDumpResult,
+                    SkBitmap /* completed/stitched pixel dump */)
+
 // Send a text dump of the WebContents to the render host.
 IPC_MESSAGE_ROUTED1(ShellViewHostMsg_TextDump,
                     std::string /* dump */)
@@ -56,6 +61,12 @@ IPC_MESSAGE_ROUTED1(ShellViewHostMsg_TextDump,
 // ShellViewMsg_LayoutDumpCompleted.
 IPC_MESSAGE_ROUTED0(ShellViewHostMsg_InitiateLayoutDump)
 
+// Asks the browser process to perform a pixel dump spanning all the
+// (potentially cross-process) frames.  This goes through multiple
+// LayoutTestControl.SnapshotFrameImag calls and ends with sending of
+// ShellViewMsg_PixelsDumpCompleted.
+IPC_MESSAGE_ROUTED0(ShellViewHostMsg_InitiatePixelsDump)
+
 // Send an image dump of the WebContents to the render host.
 IPC_MESSAGE_ROUTED2(ShellViewHostMsg_ImageDump,
                     std::string /* actual pixel hash */,