Support dragging texts into Android WebView.

content/browser/android/content_view_core_impl.cc

Index: content/browser/android/content_view_core_impl.cc
diff --git a/content/browser/android/content_view_core_impl.cc b/content/browser/android/content_view_core_impl.cc
index d70219a71ef275a274ba0f2cb91ad79fe20f34a8..04c30ba44da0d8bdf24b4b3b567bc7e4c0be63cd 100644
--- a/content/browser/android/content_view_core_impl.cc
+++ b/content/browser/android/content_view_core_impl.cc
@@ -54,6 +54,8 @@
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/android/view_android.h"
 #include "ui/android/window_android.h"
+#include "ui/base/dragdrop/drop_target_event.h"
+#include "ui/base/dragdrop/os_exchange_data_provider_android.h"
 #include "ui/events/android/motion_event_android.h"
 #include "ui/gfx/android/java_bitmap.h"
 #include "ui/gfx/geometry/point_conversions.h"
@@ -1409,6 +1411,72 @@ void ContentViewCoreImpl::SetBackgroundOpaque(JNIEnv* env,
   }
 }
 
+void ContentViewCoreImpl::OnDragEntered(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& jobj,
+    int x,
+    int y,
+    int screen_x,
+    int screen_y) {
+  WebContentsViewAndroid* wcva = static_cast<WebContentsViewAndroid*>(
+      static_cast<WebContentsImpl*>(web_contents())->GetView());
+
+  ui::OSExchangeData data(new ui::OSExchangeDataProviderAndroid());
+  ui::DropTargetEvent event(
+      data, gfx::Point(x, y), gfx::Point(screen_x, screen_y),
+      ui::DragDropTypes::DRAG_COPY);  // Android drag and drop does only copy.
+
+  wcva->OnDragEntered(event);
+}
+
+void ContentViewCoreImpl::OnDragUpdated(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& jobj,
+    int x,
+    int y,
+    int screen_x,
+    int screen_y) {
+  WebContentsViewAndroid* wcva = static_cast<WebContentsViewAndroid*>(
+      static_cast<WebContentsImpl*>(web_contents())->GetView());
+
+  ui::OSExchangeData data(new ui::OSExchangeDataProviderAndroid());
+  ui::DropTargetEvent event(
+      data, gfx::Point(x, y), gfx::Point(screen_x, screen_y),
+      ui::DragDropTypes::DRAG_COPY);  // Android drag and drop does only copy.
+
+  wcva->OnDragUpdated(event);
+}
+
+void ContentViewCoreImpl::OnPerformDrop(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& jobj,
+    int x,
+    int y,
+    int screen_x,
+    int screen_y,
+    const base::android::JavaParamRef<jstring>& content) {
+  base::string16 text_to_drop = ConvertJavaStringToUTF16(env, content);
+
+  WebContentsViewAndroid* wcva = static_cast<WebContentsViewAndroid*>(
+      static_cast<WebContentsImpl*>(web_contents())->GetView());
+
+  ui::OSExchangeData data(new ui::OSExchangeDataProviderAndroid());
+  data.SetString(text_to_drop);
+  ui::DropTargetEvent event(data, gfx::Point(x, y),
+                            gfx::Point(screen_x, screen_y),
+                            ui::DragDropTypes::DRAG_COPY);
+
+  wcva->OnPerformDrop(event);
+}
+
+void ContentViewCoreImpl::OnDragExited(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& jobj) {
+  WebContentsViewAndroid* wcva = static_cast<WebContentsViewAndroid*>(
+      static_cast<WebContentsImpl*>(web_contents())->GetView());
+  wcva->OnDragExited();
+}
+
 void ContentViewCoreImpl::RequestTextSurroundingSelection(
     int max_length,
     const base::Callback<