Expose the capturePicture feature in RenderView for Android WebView legacy API support.

android_webview/common/aw_content_client.cc

Index: android_webview/common/aw_content_client.cc
diff --git a/android_webview/common/aw_content_client.cc b/android_webview/common/aw_content_client.cc
index a7b467d8298984ad730d243856b335c50aa8b9bd..053215d6e7a98354a56931fb79f8978703fe82cd 100644
--- a/android_webview/common/aw_content_client.cc
+++ b/android_webview/common/aw_content_client.cc
@@ -5,6 +5,7 @@
 #include "android_webview/common/aw_content_client.h"
 
 #include "base/basictypes.h"
+#include "ipc/ipc_message.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "webkit/user_agent/user_agent_util.h"
@@ -35,4 +36,12 @@ base::StringPiece AwContentClient::GetDataResource(
       resource_id, scale_factor);
 }
 
+bool AwContentClient::CanSendWhileSwappedOut(const IPC::Message* message) {
+  // For legacy API support we perform a few browser -> renderer synchronous IPC
+  // messages that block the browser. However, the synchronous IPC replies might
+  // be dropped by the renderer during a swap out, deadlocking the browser.
+  // Because of this we should never drop any synchronous IPC replies.
+  return message->type() == IPC_REPLY_ID;
+}
+
 }  // namespace android_webview