[android_webview] Use auto-sizing for webviews in wrap content mode.

android_webview/common/render_view_messages.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Multiply-included file, no traditional include guard.
 #include "android_webview/common/aw_hit_test_data.h"
 #include "content/public/common/common_param_traits.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_platform_file.h"
@@ skipping 49 matching lines @@
 // Resets WebKit WebView scrolling and scale state. We need to send this
 // message whenever we want to guarantee that page's scale will be
 // recalculated by WebKit.
 IPC_MESSAGE_ROUTED0(AwViewMsg_ResetScrollAndScaleState)
 
 // Sets the initial page scale. This overrides initial scale set by
 // the meta viewport tag.
 IPC_MESSAGE_ROUTED1(AwViewMsg_SetInitialPageScale,
                     double /* page_scale_factor */)
 
+// Toggles the WebKit WebView autosizing algorthm. See
+// FrameView::autoSizeIfEnabled for the implementation.
+IPC_MESSAGE_ROUTED2(AwViewMsg_SetAutoResizeMode,
+                    bool /* enable */,
+                    int /* width */)
+
 // Sets the base background color for this view.
 IPC_MESSAGE_ROUTED1(AwViewMsg_SetBackgroundColor,
                     SkColor);
 
 IPC_MESSAGE_CONTROL1(AwViewMsg_SetJsOnlineProperty,
                      bool /* network_up */)
 
 //-----------------------------------------------------------------------------
 // RenderView messages
 // These are messages sent from the renderer to the browser process.
 
 // Response to AwViewMsg_DocumentHasImages request.
 IPC_MESSAGE_ROUTED2(AwViewHostMsg_DocumentHasImagesResponse,
                     int, /* id */
                     bool /* has_images */)
 
 // Response to AwViewMsg_DoHitTest.
 IPC_MESSAGE_ROUTED1(AwViewHostMsg_UpdateHitTestData,
                     android_webview::AwHitTestData)
 
 // Sent whenever the page scale factor (as seen by RenderView) is changed.
 IPC_MESSAGE_ROUTED1(AwViewHostMsg_PageScaleFactorChanged,
                     float /* page_scale_factor */)