I noticed an assertion error when interacting in a corner case: tap to select text, without scrolling longpress on a link to show the Context Menu (TTS hides), then longpress select and manually adjust the selection.

The CSM should probably check that there's a longpress or tap selection before calling showContextualSearch.

06-27 15:10:20.240  4380  4380 W System.err: java.lang.AssertionError
06-27 15:10:20.241  4380  4380 W System.err: 	at org.chromium.chrome.browser.contextualsearch.ContextualSearchManager.showContextualSearch(ContextualSearchManager.java:481)
06-27 15:10:20.241  4380  4380 W System.err: 	at org.chromium.chrome.browser.contextualsearch.ContextualSearchManager.access$2400(ContextualSearchManager.java:66)
06-27 15:10:20.241  4380  4380 W System.err: 	at org.chromium.chrome.browser.contextualsearch.ContextualSearchManager$6.showContextualSearchLongpressUi(ContextualSearchManager.java:1551)
06-27 15:10:20.241  4380  4380 W System.err: 	at org.chromium.chrome.browser.contextualsearch.ContextualSearchInternalStateController.startWorkingOn(ContextualSearchInternalStateController.java:228)
06-27 15:10:20.241  4380  4380 W System.err: 	at org.chromium.chrome.browser.contextualsearch.ContextualSearchInternalStateController.transitionTo(ContextualSearchInternalStateController.java:208)
06-27 15:10:20.241  4380  4380 W System.err: 	at org.chromium.chrome.browser.contextualsearch.ContextualSearchInternalStateController.transitionTo(ContextualSearchInternalStateController.java:190)
06-27 15:10:20.241  4380  4380 W System.err: 	at org.chromium.chrome.browser.contextualsearch.ContextualSearchInternalStateController.finishWorkingOn(ContextualSearchInternalStateController.java:306)
06-27 15:10:20.241  4380  4380 W System.err: 	at org.chromium.chrome.browser.contextualsearch.ContextualSearchInternalStateController.notifyFinishedWorkOn(ContextualSearchInternalStateController.java:174)
06-27 15:10:20.241  4380  4380 W System.err: 	at org.chromium.chrome.browser.contextualsearch.ContextualSearchManager.onTextSurroundingSelectionAvailable(ContextualSearchManager.java:595)
06-27 15:10:20.241  4380  4380 W System.err: 	at org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce(Native Method)
06-27 15:10:20.241  4380  4380 W System.err: 	at org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:41)
06-27 15:10:20.241  4380  4380 W System.err: 	at android.os.Handler.dispatchMessage(Handler.java:102)
06-27 15:10:20.241  4380  4380 W System.err: 	at android.os.Looper.loop(Looper.java:148)
06-27 15:10:20.241  4380  4380 W System.err: 	at android.app.ActivityThread.main(ActivityThread.java:5417)
06-27 15:10:20.241  4380  4380 W System.err: 	at java.lang.reflect.Method.invoke(Native Method)
06-27 15:10:20.241  4380  4380 W System.err: 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
06-27 15:10:20.241  4380  4380 W System.err: 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)