Support dragging texts into Android WebView.

content/browser/web_contents/web_contents_view_android.cc

Index: content/browser/web_contents/web_contents_view_android.cc
diff --git a/content/browser/web_contents/web_contents_view_android.cc b/content/browser/web_contents/web_contents_view_android.cc
index 0716d13d2fb2ae9053899b12397de5234c4c44ea..8495f25e96b77311a09789823fc38e6d376fb269 100644
--- a/content/browser/web_contents/web_contents_view_android.cc
+++ b/content/browser/web_contents/web_contents_view_android.cc
@@ -13,8 +13,10 @@
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/web_contents_delegate.h"
+#include "content/public/common/drop_data.h"
 
 namespace content {
+
 WebContentsView* CreateWebContentsView(
     WebContentsImpl* web_contents,
     WebContentsViewDelegate* delegate,
@@ -199,6 +201,37 @@ void WebContentsViewAndroid::UpdateDragCursor(blink::WebDragOperation op) {
   NOTIMPLEMENTED();
 }
 
+void WebContentsViewAndroid::OnDragEntered(
+    const std::vector<DropData::Metadata>& metadata,
+    std::vector<int> locations) {
+  const gfx::Point location(locations[0], locations[1]);
+  const gfx::Point screen_location(locations[2], locations[3]);
+
+  web_contents_->GetRenderViewHost()->DragTargetDragEnterWithMetaData(
+      metadata, location, screen_location, blink::WebDragOperationCopy, 0);
+}
+void WebContentsViewAndroid::OnDragUpdated(std::vector<int> locations) {
+  const gfx::Point location(locations[0], locations[1]);
+  const gfx::Point screen_location(locations[2], locations[3]);
+
+  web_contents_->GetRenderViewHost()->DragTargetDragOver(
+      location, screen_location, blink::WebDragOperationCopy, 0);
+}
+
+void WebContentsViewAndroid::OnDragExited() {
+  web_contents_->GetRenderViewHost()->DragTargetDragLeave();
+}
+
+void WebContentsViewAndroid::OnPerformDrop(DropData& drop_data,
+                                           std::vector<int> locations) {
+  const gfx::Point location(locations[0], locations[1]);
+  const gfx::Point screen_location(locations[2], locations[3]);
+
+  web_contents_->GetRenderViewHost()->FilterDropData(&drop_data);
+  web_contents_->GetRenderViewHost()->DragTargetDrop(drop_data, location,
+                                                     screen_location, 0);
+}
+
 void WebContentsViewAndroid::GotFocus() {
   // This is only used in the views FocusManager stuff but it bleeds through
   // all subclasses. http://crbug.com/21875