[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..dfad0a922b69077608fd27cfff9b35761b260b1e 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"
@@ -69,6 +70,7 @@ using base::android::ScopedJavaGlobalRef;
 using base::android::ScopedJavaLocalRef;
 using blink::WebGestureEvent;
 using blink::WebInputEvent;
+using blink::WebMouseEvent;
 
 // Describes the type and enabled state of a select popup item.
 namespace {
@@ -222,7 +224,9 @@ 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.";
 
@@ -946,7 +950,9 @@ 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,
+                                           jint android_button_state) {
   RenderWidgetHostViewAndroid* rwhv = GetRenderWidgetHostViewAndroid();
   // Avoid synthesizing a touch event if it cannot be forwarded.
   if (!rwhv)
@@ -971,6 +977,20 @@ jboolean ContentViewCoreImpl::OnTouchEvent(JNIEnv* env,
                            raw_pos_x,
                            raw_pos_y);
 
+  switch (event.GetAction()) {
+    case ui::MotionEvent::ACTION_DOWN:
+      mouse_drag_start_x_ = pos_x_0;
+      mouse_drag_start_y_ = pos_y_0;
+      break;
+    case ui::MotionEvent::ACTION_MOVE:
+    case ui::MotionEvent::ACTION_UP:
+      SelectBetweenCoordinates(env, obj, mouse_drag_start_x_,
+                               mouse_drag_start_y_, pos_x_0, pos_y_0);
+      break;
+    default:
+      break;
+  }
+
   return rwhv->OnTouchEvent(event);
 }
 
@@ -989,7 +1009,7 @@ jboolean ContentViewCoreImpl::SendMouseMoveEvent(JNIEnv* env,
 
   blink::WebMouseEvent event = WebMouseEventBuilder::Build(
       WebInputEvent::MouseMove,
-      blink::WebMouseEvent::ButtonNone,
+      WebMouseEvent::ButtonNone,
       time_ms / 1000.0, x / dpi_scale(), y / dpi_scale(), 0, 1);
 
   rwhv->SendMouseEvent(event);