Move cache clearing from AwRenderViewExt to AwRenderFrameExt.

android_webview/renderer/aw_render_frame_ext.cc

Index: android_webview/renderer/aw_render_frame_ext.cc
diff --git a/android_webview/renderer/aw_render_frame_ext.cc b/android_webview/renderer/aw_render_frame_ext.cc
index 69b06f05458d8f66dd32f89e7b9c987892e3d47e..dba80725ef77fa086a5cf98ac1961df6ea2d30ce 100644
--- a/android_webview/renderer/aw_render_frame_ext.cc
+++ b/android_webview/renderer/aw_render_frame_ext.cc
@@ -17,6 +17,7 @@
 #include "third_party/WebKit/public/web/WebElementCollection.h"
 #include "third_party/WebKit/public/web/WebFrameWidget.h"
 #include "third_party/WebKit/public/web/WebHitTestResult.h"
+#include "third_party/WebKit/public/web/WebImageCache.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 #include "third_party/WebKit/public/web/WebMeaningfulLayout.h"
 #include "third_party/WebKit/public/web/WebNode.h"
@@ -146,6 +147,15 @@ void AwRenderFrameExt::DidCommitProvisionalLoad(bool is_new_navigation,
     blink::WebSecurityOrigin origin = frame->document().getSecurityOrigin();
     origin.grantLoadLocalResources();
   }
+
+  // Clear the cache when we cross site boundaries in the main frame.

[boliu, 2016/03/10 21:59:58]

Can add what we found in the email thread as a comment for the next person? ie
goal here is to clear cache when multi-process chrome would have moved to a new
renderer process.

[Avi (use Gerrit), 2016/03/10 22:07:56]

Done.

+  if (!frame->parent()) {
+    url::Origin new_origin(frame->document().url());
+    if (!new_origin.IsSameOriginWith(last_origin_)) {
+      last_origin_ = new_origin;
+      blink::WebImageCache::clear();
+    }
+  }
 }
 
 bool AwRenderFrameExt::OnMessageReceived(const IPC::Message& message) {