[Android] Select text when stylus first button is pressed.

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 2335d0a5fb05b9ca4df9420b4bb70bf60b3a5609..9dfe2107accf83c9dd9a3eeccc9fb02ad32abcd9 100644
--- a/content/browser/android/content_view_core_impl.cc
+++ b/content/browser/android/content_view_core_impl.cc
@@ -55,6 +55,7 @@
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/base/android/view_android.h"
 #include "ui/base/android/window_android.h"
+#include "ui/events/gesture_detection/motion_event.h"
 #include "ui/gfx/android/java_bitmap.h"
 #include "ui/gfx/screen.h"
 #include "ui/gfx/size_conversions.h"
@@ -222,7 +223,9 @@ ContentViewCoreImpl::ContentViewCoreImpl(
       view_android_(view_android),
       window_android_(window_android),
       device_orientation_(0),
-      accessibility_enabled_(false) {
+      accessibility_enabled_(false),
+      mouse_drag_start_x_(0),
+      mouse_drag_start_y_(0) {
   CHECK(web_contents) <<
       "A ContentViewCoreImpl should be created with a valid WebContents.";
 
@@ -929,6 +932,15 @@ void ContentViewCoreImpl::SendOrientationChangeEvent(JNIEnv* env,
   }
 }
 
+// static
+bool ContentViewCoreImpl::ShouldConvertToMouseEvent(
+    const ui::MotionEvent& event) {
+  // Currently we aren't supporting stylus + touch case.
+  return event.GetPointerCount() > 0 &&
+      event.GetToolType(0) == ui::MotionEvent::TOOL_TYPE_STYLUS &&
+      event.GetButtonState() == ui::MotionEvent::BUTTON_SECONDARY;
+}
+
 jboolean ContentViewCoreImpl::OnTouchEvent(JNIEnv* env,
                                            jobject obj,
                                            jobject motion_event,
@@ -946,7 +958,10 @@ jboolean ContentViewCoreImpl::OnTouchEvent(JNIEnv* env,
                                            jfloat touch_major_0,
                                            jfloat touch_major_1,
                                            jfloat raw_pos_x,
-                                           jfloat raw_pos_y) {
+                                           jfloat raw_pos_y,
+                                           jint android_tool_type_0,
+                                           jint android_tool_type_1,
+                                           jint android_button_state) {
   RenderWidgetHostViewAndroid* rwhv = GetRenderWidgetHostViewAndroid();
   // Avoid synthesizing a touch event if it cannot be forwarded.
   if (!rwhv)
@@ -969,9 +984,38 @@ jboolean ContentViewCoreImpl::OnTouchEvent(JNIEnv* env,
                            touch_major_0,
                            touch_major_1,
                            raw_pos_x,
-                           raw_pos_y);
-
-  return rwhv->OnTouchEvent(event);
+                           raw_pos_y,
+                           android_tool_type_0,
+                           android_tool_type_1,
+                           android_button_state);
+
+  bool result = rwhv->OnTouchEvent(event);
+
+  // Select text and show handles if necessary.
+  if (result && ShouldConvertToMouseEvent(event)) {
+    Java_ContentViewCore_showSelectionHandlesAutomatically(env, obj);
+    switch (event.GetAction()) {
+      case ui::MotionEvent::ACTION_DOWN:
+        web_contents_->Unselect();
+        mouse_drag_start_x_ = pos_x_0;
+        mouse_drag_start_y_ = pos_y_0;
+        break;
+      case ui::MotionEvent::ACTION_MOVE:
+        SelectBetweenCoordinates(env, obj, mouse_drag_start_x_,
+                                 mouse_drag_start_y_, pos_x_0, pos_y_0);
+        break;
+      case ui::MotionEvent::ACTION_UP:
+        SelectBetweenCoordinates(env, obj, mouse_drag_start_x_,
+                                 mouse_drag_start_y_, pos_x_0, pos_y_0);
+        break;
+      case ui::MotionEvent::ACTION_CANCEL:
+        web_contents_->Unselect();
+        break;
+      default:
+        break;
+    }
+  }
+  return result;
 }
 
 float ContentViewCoreImpl::GetDpiScale() const {